WatchGas SST1 Serviceable CH4S Gas Detector SST1-MM
Description
Methanethiol is the odorant added to natural gas so workers know when there's a leak. Which is exactly what makes ppm measurement of methyl mercaptan counterintuitive in the industrial settings that produce or handle it.
If you work in gas odorization, kraft pulp and paper, wastewater treatment, landfill operations, or petrochemical refining, methyl mercaptan is the background smell of the job. Its odor detection threshold sits at roughly 1 ppb — more than 10,000 times below OSHA's 10 ppm ceiling limit and 500 times below NIOSH's REL ceiling of 0.5 ppm. That's a huge sensitivity margin, but it inverts into a problem: with no ppm reading, workers either become desensitized to the alarm system that smell is supposed to provide, or overreact to smells that are far below any exposure concern.
The WatchGas SST1-MM Serviceable Methanethiol Gas Detector gives you a number instead of a nose.
It reads methanethiol (CH4S, also known as methyl mercaptan or CH3SH) continuously in ppm across a 0–100 ppm range — spanning the regulatory range up to just below the NIOSH IDLH of 150 ppm. Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA (10 ppm ceiling under 29 CFR 1910.1000 Table Z-1), NIOSH (0.5 ppm ceiling per the NIOSH Pocket Guide), ACGIH (0.5 ppm TLV-TWA), or a stricter internal exposure program. Default alarm setpoints ship at Low 2 ppm and High 5 ppm — configurable to match your facility's specific program.
Why utility operators, pulp mill safety supervisors, and wastewater treatment managers pick the SST1 line for methanethiol monitoring:
- Continuous CH4S monitoring in ppm with configurable Low, High, TWA, and STEL alarms
- Serviceable sensor — replace the methanethiol cell instead of the whole unit at end-of-life
- 3-year instrument warranty (vs. the industry-typical 2 years); sensor warranty is 1 year, reflecting the specialty chemistry of methyl mercaptan sensors
- 3-year replaceable battery based on typical alarm exposure
- Solid polymer sensor technology — compact, robust, temperature-tolerant
- NFC configuration and WatchGas App integration for datalogging
- Vibration + audible + visual alarms — you notice it in a pulp mill's turpentine floor or a gas odorization facility
- Bump test and calibration compatible with the
WatchGas SST-DOCK; compliance check-in compatible with the
WatchGas SST-KIOSK
Sensor and alarm specifications:
Sensor
Gas measuring range
Low alarm (default)
High alarm (default)
CH4S (methanethiol)
0 – 100 ppm
2 ppm
5 ppm
PK Safety services the full WatchGas SST line with factory-trained technicians in-house. We also handle BW/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet. When the CH4S sensor drifts or needs replacement, send the unit to us — you're not shipping equipment into a black box. Call us at
800.829.9580 to talk through your methanethiol monitoring setup with someone who understands the SST1 platform.
This is right for you if:
- You work in natural gas or LPG odorization — utility operations, pipeline monitoring, propane distribution (methanethiol is the odorant added to natural gas)
- You operate in kraft pulp and paper — the Kraft process produces methanethiol along with dimethyl sulfide and dimethyl disulfide (the "total reduced sulfur" or TRS group)
- You supervise wastewater treatment, or any operation with anaerobic bacterial decomposition where CH4S is produced alongside H2S
- You manage landfill operations, anaerobic digestion, or biogas production — methanethiol is a common biogas contaminant
- You work in petrochemical refining or sulfur recovery — mercaptan removal and hydrotreating produce methanethiol byproducts
- You run rendering, animal byproduct processing, or specialty chemical manufacturing where CH4S is a process gas
- You need continuous methanethiol exposure logs for OSHA respiratory protection compliance, EPA odor management programs, or internal safety audits
Technical documents:
Brochure
Specification Sheet
Quick Start Guide
Part Number: WG01-SST1-MM — SST1-MM Serviceable Methanethiol (CH4S / Methyl Mercaptan) Gas Detector, 0–100 ppm range, real-time display
Frequently Asked Questions
What is the OSHA exposure limit for methanethiol?
OSHA's permissible exposure limit (PEL) for methyl mercaptan (methanethiol) is 10 ppm as a ceiling limit under 29 CFR 1910.1000 Table Z-1 — meaning the concentration must never exceed 10 ppm at any moment during the workday, not an 8-hour average. NIOSH's recommended exposure limit (REL) is far more conservative: 0.5 ppm ceiling (per the NIOSH Pocket Guide). ACGIH sets a TLV-TWA of 0.5 ppm for an 8-hour workday.
The SST1-MM ships with default alarm setpoints of Low 2 ppm and High 5 ppm. Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA, NIOSH, ACGIH, or a stricter internal program.
Which industries typically require methanethiol monitoring?
Methanethiol monitoring is a compliance or best-practice requirement in several settings: natural gas and LPG odorization (utilities, pipelines, propane distribution — methanethiol is the odorant added to natural gas), kraft pulp and paper (Kraft process gases include methanethiol along with dimethyl sulfide and dimethyl disulfide — the "total reduced sulfur" or TRS group), wastewater treatment (bacterial decomposition produces methanethiol alongside H2S), landfill operations and anaerobic digestion (biogas), petrochemical refining and sulfur recovery (mercaptan removal, hydrotreating), and rendering / animal byproduct processing.
Any workplace where methanethiol is produced or handled falls under OSHA's respiratory protection standard (29 CFR 1910.134). Facilities near populated areas may additionally have EPA odor management or ambient-air obligations under the Clean Air Act.
Can I detect methanethiol by smell instead of using a monitor?
Not reliably. Methanethiol has one of the lowest odor detection thresholds of any industrial gas — most workers can smell it below 1 ppb, which is roughly 10,000 times below OSHA's ceiling limit of 10 ppm and 500 times below NIOSH's REL ceiling of 0.5 ppm. That means workers in industries that produce or handle methyl mercaptan smell it constantly at concentrations far below any regulatory concern.
The paradox: with no ppm reading, workers either become desensitized to the smell (treating it as background) or overreact (treating every whiff as an emergency). Neither response tells you where you are on the exposure scale. A continuous ppm readout from the SST1-MM shows the actual concentration — background-level nuisance smell versus an actual approach to the OSHA ceiling limit — and produces the audit-ready exposure log that compliance programs and internal safety reviews need.
What does "serviceable" mean on the SST1-MM?
Traditional single-gas monitors are single-use — when the sensor reaches end-of-life, the whole unit gets replaced. The SST1 platform is designed to be serviced: the methanethiol sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.
Instrument warranty is 3 years; sensor warranty is 1 year, which is shorter than the SST1's H2S or CO variants and reflects the specialty chemistry of methyl mercaptan sensors (mercaptan-selective sensor cells have shorter typical service lives than the more common sulfide or oxide detection chemistries). PK Safety services the WatchGas SST line in-house — send the unit in when the sensor needs replacement.
Does the SST1-MM work with the WatchGas SST-DOCK and SST-KIOSK?
Yes to both. The SST1-MM is fully compatible with the
WatchGas SST-DOCK Touchscreen docking station for automatic bump testing, calibration, and datalogging (about 60 seconds per unit), and with the
WatchGas SST-KIOSK compliance kiosk for fleet-level compliance check-in, alarm history upload, and user/location tracking.
If you're running a fleet of SST1 monitors across a gas utility, a pulp mill, or a wastewater plant, the SST-DOCK + SST-KIOSK combination covers your bump/cal workflow and your compliance-tracking workflow together.
How does PK Safety support the SST1-MM after purchase?
PK Safety carries the full WatchGas SST line and services the SST1-MM with factory-trained technicians in-house. That includes methanethiol sensor replacement when the cell reaches end-of-life, calibration, firmware updates, and warranty support (3-year instrument warranty, 1-year sensor warranty). Call
800.829.9580 to talk through your methanethiol monitoring setup with someone who knows the SST1 platform — not a call-center script.
Not sure this is the right fit? Call PK Safety at 800.829.9580. A person who knows methanethiol monitoring and the WatchGas SST platform will pick up.
Read more
Description
Methanethiol is the odorant added to natural gas so workers know when there's a leak. Which is exactly what makes ppm measurement of methyl mercaptan counterintuitive in the industrial settings that produce or handle it.
If you work in gas odorization, kraft pulp and paper, wastewater treatment, landfill operations, or petrochemical refining, methyl mercaptan is the background smell of the job. Its odor detection threshold sits at roughly 1 ppb — more than 10,000 times below OSHA's 10 ppm ceiling limit and 500 times below NIOSH's REL ceiling of 0.5 ppm. That's a huge sensitivity margin, but it inverts into a problem: with no ppm reading, workers either become desensitized to the alarm system that smell is supposed to provide, or overreact to smells that are far below any exposure concern.
The WatchGas SST1-MM Serviceable Methanethiol Gas Detector gives you a number instead of a nose.
It reads methanethiol (CH4S, also known as methyl mercaptan or CH3SH) continuously in ppm across a 0–100 ppm range — spanning the regulatory range up to just below the NIOSH IDLH of 150 ppm. Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA (10 ppm ceiling under 29 CFR 1910.1000 Table Z-1), NIOSH (0.5 ppm ceiling per the NIOSH Pocket Guide), ACGIH (0.5 ppm TLV-TWA), or a stricter internal exposure program. Default alarm setpoints ship at Low 2 ppm and High 5 ppm — configurable to match your facility's specific program.
Why utility operators, pulp mill safety supervisors, and wastewater treatment managers pick the SST1 line for methanethiol monitoring:
- Continuous CH4S monitoring in ppm with configurable Low, High, TWA, and STEL alarms
- Serviceable sensor — replace the methanethiol cell instead of the whole unit at end-of-life
- 3-year instrument warranty (vs. the industry-typical 2 years); sensor warranty is 1 year, reflecting the specialty chemistry of methyl mercaptan sensors
- 3-year replaceable battery based on typical alarm exposure
- Solid polymer sensor technology — compact, robust, temperature-tolerant
- NFC configuration and WatchGas App integration for datalogging
- Vibration + audible + visual alarms — you notice it in a pulp mill's turpentine floor or a gas odorization facility
- Bump test and calibration compatible with the WatchGas SST-DOCK; compliance check-in compatible with the WatchGas SST-KIOSK
Sensor and alarm specifications:
| Sensor | Gas measuring range | Low alarm (default) | High alarm (default) |
| CH4S (methanethiol) | 0 – 100 ppm | 2 ppm | 5 ppm |
PK Safety services the full WatchGas SST line with factory-trained technicians in-house. We also handle BW/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet. When the CH4S sensor drifts or needs replacement, send the unit to us — you're not shipping equipment into a black box. Call us at 800.829.9580 to talk through your methanethiol monitoring setup with someone who understands the SST1 platform.
This is right for you if:
- You work in natural gas or LPG odorization — utility operations, pipeline monitoring, propane distribution (methanethiol is the odorant added to natural gas)
- You operate in kraft pulp and paper — the Kraft process produces methanethiol along with dimethyl sulfide and dimethyl disulfide (the "total reduced sulfur" or TRS group)
- You supervise wastewater treatment, or any operation with anaerobic bacterial decomposition where CH4S is produced alongside H2S
- You manage landfill operations, anaerobic digestion, or biogas production — methanethiol is a common biogas contaminant
- You work in petrochemical refining or sulfur recovery — mercaptan removal and hydrotreating produce methanethiol byproducts
- You run rendering, animal byproduct processing, or specialty chemical manufacturing where CH4S is a process gas
- You need continuous methanethiol exposure logs for OSHA respiratory protection compliance, EPA odor management programs, or internal safety audits
Technical documents:
Brochure
Specification Sheet
Quick Start Guide
Part Number: WG01-SST1-MM — SST1-MM Serviceable Methanethiol (CH4S / Methyl Mercaptan) Gas Detector, 0–100 ppm range, real-time display
Frequently Asked Questions
What is the OSHA exposure limit for methanethiol?
OSHA's permissible exposure limit (PEL) for methyl mercaptan (methanethiol) is 10 ppm as a ceiling limit under 29 CFR 1910.1000 Table Z-1 — meaning the concentration must never exceed 10 ppm at any moment during the workday, not an 8-hour average. NIOSH's recommended exposure limit (REL) is far more conservative: 0.5 ppm ceiling (per the NIOSH Pocket Guide). ACGIH sets a TLV-TWA of 0.5 ppm for an 8-hour workday.
The SST1-MM ships with default alarm setpoints of Low 2 ppm and High 5 ppm. Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA, NIOSH, ACGIH, or a stricter internal program.
Which industries typically require methanethiol monitoring?
Methanethiol monitoring is a compliance or best-practice requirement in several settings: natural gas and LPG odorization (utilities, pipelines, propane distribution — methanethiol is the odorant added to natural gas), kraft pulp and paper (Kraft process gases include methanethiol along with dimethyl sulfide and dimethyl disulfide — the "total reduced sulfur" or TRS group), wastewater treatment (bacterial decomposition produces methanethiol alongside H2S), landfill operations and anaerobic digestion (biogas), petrochemical refining and sulfur recovery (mercaptan removal, hydrotreating), and rendering / animal byproduct processing.
Any workplace where methanethiol is produced or handled falls under OSHA's respiratory protection standard (29 CFR 1910.134). Facilities near populated areas may additionally have EPA odor management or ambient-air obligations under the Clean Air Act.
Can I detect methanethiol by smell instead of using a monitor?
Not reliably. Methanethiol has one of the lowest odor detection thresholds of any industrial gas — most workers can smell it below 1 ppb, which is roughly 10,000 times below OSHA's ceiling limit of 10 ppm and 500 times below NIOSH's REL ceiling of 0.5 ppm. That means workers in industries that produce or handle methyl mercaptan smell it constantly at concentrations far below any regulatory concern.
The paradox: with no ppm reading, workers either become desensitized to the smell (treating it as background) or overreact (treating every whiff as an emergency). Neither response tells you where you are on the exposure scale. A continuous ppm readout from the SST1-MM shows the actual concentration — background-level nuisance smell versus an actual approach to the OSHA ceiling limit — and produces the audit-ready exposure log that compliance programs and internal safety reviews need.
What does "serviceable" mean on the SST1-MM?
Traditional single-gas monitors are single-use — when the sensor reaches end-of-life, the whole unit gets replaced. The SST1 platform is designed to be serviced: the methanethiol sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.
Instrument warranty is 3 years; sensor warranty is 1 year, which is shorter than the SST1's H2S or CO variants and reflects the specialty chemistry of methyl mercaptan sensors (mercaptan-selective sensor cells have shorter typical service lives than the more common sulfide or oxide detection chemistries). PK Safety services the WatchGas SST line in-house — send the unit in when the sensor needs replacement.
Does the SST1-MM work with the WatchGas SST-DOCK and SST-KIOSK?
Yes to both. The SST1-MM is fully compatible with the WatchGas SST-DOCK Touchscreen docking station for automatic bump testing, calibration, and datalogging (about 60 seconds per unit), and with the WatchGas SST-KIOSK compliance kiosk for fleet-level compliance check-in, alarm history upload, and user/location tracking.
If you're running a fleet of SST1 monitors across a gas utility, a pulp mill, or a wastewater plant, the SST-DOCK + SST-KIOSK combination covers your bump/cal workflow and your compliance-tracking workflow together.
How does PK Safety support the SST1-MM after purchase?
PK Safety carries the full WatchGas SST line and services the SST1-MM with factory-trained technicians in-house. That includes methanethiol sensor replacement when the cell reaches end-of-life, calibration, firmware updates, and warranty support (3-year instrument warranty, 1-year sensor warranty). Call 800.829.9580 to talk through your methanethiol monitoring setup with someone who knows the SST1 platform — not a call-center script.
Not sure this is the right fit? Call PK Safety at 800.829.9580. A person who knows methanethiol monitoring and the WatchGas SST platform will pick up.
Methanethiol is the odorant added to natural gas so workers know when there's a leak. Which is exactly what makes ppm measurement of methyl mercaptan counterintuitive in the industrial settings that produce or handle it.
If you work in gas odorization, kraft pulp and paper, wastewater treatment, landfill operations, or petrochemical refining, methyl mercaptan is the background smell of the job. Its odor detection threshold sits at roughly 1 ppb — more than 10,000 times below OSHA's 10 ppm ceiling limit and 500 times below NIOSH's REL ceiling of 0.5 ppm. That's a huge sensitivity margin, but it inverts into a problem: with no ppm reading, workers either become desensitized to the alarm system that smell is supposed to provide, or overreact to smells that are far below any exposure concern.
The WatchGas SST1-MM Serviceable Methanethiol Gas Detector gives you a number instead of a nose.
It reads methanethiol (CH4S, also known as methyl mercaptan or CH3SH) continuously in ppm across a 0–100 ppm range — spanning the regulatory range up to just below the NIOSH IDLH of 150 ppm. Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA (10 ppm ceiling under 29 CFR 1910.1000 Table Z-1), NIOSH (0.5 ppm ceiling per the NIOSH Pocket Guide), ACGIH (0.5 ppm TLV-TWA), or a stricter internal exposure program. Default alarm setpoints ship at Low 2 ppm and High 5 ppm — configurable to match your facility's specific program.
Why utility operators, pulp mill safety supervisors, and wastewater treatment managers pick the SST1 line for methanethiol monitoring:
- Continuous CH4S monitoring in ppm with configurable Low, High, TWA, and STEL alarms
- Serviceable sensor — replace the methanethiol cell instead of the whole unit at end-of-life
- 3-year instrument warranty (vs. the industry-typical 2 years); sensor warranty is 1 year, reflecting the specialty chemistry of methyl mercaptan sensors
- 3-year replaceable battery based on typical alarm exposure
- Solid polymer sensor technology — compact, robust, temperature-tolerant
- NFC configuration and WatchGas App integration for datalogging
- Vibration + audible + visual alarms — you notice it in a pulp mill's turpentine floor or a gas odorization facility
- Bump test and calibration compatible with the WatchGas SST-DOCK; compliance check-in compatible with the WatchGas SST-KIOSK
Sensor and alarm specifications:
| Sensor | Gas measuring range | Low alarm (default) | High alarm (default) |
| CH4S (methanethiol) | 0 – 100 ppm | 2 ppm | 5 ppm |
PK Safety services the full WatchGas SST line with factory-trained technicians in-house. We also handle BW/Honeywell (Factory Authorized Service Center), RKI, and RAE Systems monitors — one shop for a mixed-brand fleet. When the CH4S sensor drifts or needs replacement, send the unit to us — you're not shipping equipment into a black box. Call us at 800.829.9580 to talk through your methanethiol monitoring setup with someone who understands the SST1 platform.
This is right for you if:
- You work in natural gas or LPG odorization — utility operations, pipeline monitoring, propane distribution (methanethiol is the odorant added to natural gas)
- You operate in kraft pulp and paper — the Kraft process produces methanethiol along with dimethyl sulfide and dimethyl disulfide (the "total reduced sulfur" or TRS group)
- You supervise wastewater treatment, or any operation with anaerobic bacterial decomposition where CH4S is produced alongside H2S
- You manage landfill operations, anaerobic digestion, or biogas production — methanethiol is a common biogas contaminant
- You work in petrochemical refining or sulfur recovery — mercaptan removal and hydrotreating produce methanethiol byproducts
- You run rendering, animal byproduct processing, or specialty chemical manufacturing where CH4S is a process gas
- You need continuous methanethiol exposure logs for OSHA respiratory protection compliance, EPA odor management programs, or internal safety audits
Technical documents:
Brochure
Specification Sheet
Quick Start Guide
Part Number: WG01-SST1-MM — SST1-MM Serviceable Methanethiol (CH4S / Methyl Mercaptan) Gas Detector, 0–100 ppm range, real-time display
Frequently Asked Questions
What is the OSHA exposure limit for methanethiol?
OSHA's permissible exposure limit (PEL) for methyl mercaptan (methanethiol) is 10 ppm as a ceiling limit under 29 CFR 1910.1000 Table Z-1 — meaning the concentration must never exceed 10 ppm at any moment during the workday, not an 8-hour average. NIOSH's recommended exposure limit (REL) is far more conservative: 0.5 ppm ceiling (per the NIOSH Pocket Guide). ACGIH sets a TLV-TWA of 0.5 ppm for an 8-hour workday.
The SST1-MM ships with default alarm setpoints of Low 2 ppm and High 5 ppm. Configurable low, high, TWA, and STEL alarms let you tune the monitor to whichever standard your facility runs against — OSHA, NIOSH, ACGIH, or a stricter internal program.
Which industries typically require methanethiol monitoring?
Methanethiol monitoring is a compliance or best-practice requirement in several settings: natural gas and LPG odorization (utilities, pipelines, propane distribution — methanethiol is the odorant added to natural gas), kraft pulp and paper (Kraft process gases include methanethiol along with dimethyl sulfide and dimethyl disulfide — the "total reduced sulfur" or TRS group), wastewater treatment (bacterial decomposition produces methanethiol alongside H2S), landfill operations and anaerobic digestion (biogas), petrochemical refining and sulfur recovery (mercaptan removal, hydrotreating), and rendering / animal byproduct processing.
Any workplace where methanethiol is produced or handled falls under OSHA's respiratory protection standard (29 CFR 1910.134). Facilities near populated areas may additionally have EPA odor management or ambient-air obligations under the Clean Air Act.
Can I detect methanethiol by smell instead of using a monitor?
Not reliably. Methanethiol has one of the lowest odor detection thresholds of any industrial gas — most workers can smell it below 1 ppb, which is roughly 10,000 times below OSHA's ceiling limit of 10 ppm and 500 times below NIOSH's REL ceiling of 0.5 ppm. That means workers in industries that produce or handle methyl mercaptan smell it constantly at concentrations far below any regulatory concern.
The paradox: with no ppm reading, workers either become desensitized to the smell (treating it as background) or overreact (treating every whiff as an emergency). Neither response tells you where you are on the exposure scale. A continuous ppm readout from the SST1-MM shows the actual concentration — background-level nuisance smell versus an actual approach to the OSHA ceiling limit — and produces the audit-ready exposure log that compliance programs and internal safety reviews need.
What does "serviceable" mean on the SST1-MM?
Traditional single-gas monitors are single-use — when the sensor reaches end-of-life, the whole unit gets replaced. The SST1 platform is designed to be serviced: the methanethiol sensor cell can be replaced, extending the monitor's service life beyond the sensor's own lifespan.
Instrument warranty is 3 years; sensor warranty is 1 year, which is shorter than the SST1's H2S or CO variants and reflects the specialty chemistry of methyl mercaptan sensors (mercaptan-selective sensor cells have shorter typical service lives than the more common sulfide or oxide detection chemistries). PK Safety services the WatchGas SST line in-house — send the unit in when the sensor needs replacement.
Does the SST1-MM work with the WatchGas SST-DOCK and SST-KIOSK?
Yes to both. The SST1-MM is fully compatible with the WatchGas SST-DOCK Touchscreen docking station for automatic bump testing, calibration, and datalogging (about 60 seconds per unit), and with the WatchGas SST-KIOSK compliance kiosk for fleet-level compliance check-in, alarm history upload, and user/location tracking.
If you're running a fleet of SST1 monitors across a gas utility, a pulp mill, or a wastewater plant, the SST-DOCK + SST-KIOSK combination covers your bump/cal workflow and your compliance-tracking workflow together.
How does PK Safety support the SST1-MM after purchase?
PK Safety carries the full WatchGas SST line and services the SST1-MM with factory-trained technicians in-house. That includes methanethiol sensor replacement when the cell reaches end-of-life, calibration, firmware updates, and warranty support (3-year instrument warranty, 1-year sensor warranty). Call 800.829.9580 to talk through your methanethiol monitoring setup with someone who knows the SST1 platform — not a call-center script.
Not sure this is the right fit? Call PK Safety at 800.829.9580. A person who knows methanethiol monitoring and the WatchGas SST platform will pick up.
Specifications
Specifications
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MPN
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Gas Type
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Product Weight (lbs.)
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Warranty Info
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