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RKI Instruments Regulator, with gauge & knob (17/34L, 0.5 LPM or 34AL/58AL/103L, 0.5 LPM).
Part Number:
81-1050RK For 17/34L (CGA 600 Connection, FEMALE THREADED, for Steel bottles) (image 1)
81-1051RK For 34AL/58AL/103L (C10 Connection,MALE THREADED, for Aluminum bottles) (image 2)