REGULATOR SERIES RUH8211-1 RUH82 SERIES, MEDIUM/HEAVY DUTY - Machined brass body - Polished chrome bonnet - Easy-to-read single scale 2" gauges - 2" tri-layered reinforced neoprene diaphragm - Heavy duty mechanical stem type seat and nozzle assembly - Delrin bushing for smooth flow adjustment - Porous metal inlet filter (except C02 models) - Fine mesh filter screen between inlet and seat - Pressure relief device for low pressure gauge protection only CGA INLET / ACETYLENE: 300 OUTLET CONNECTION / “B” (LH) 9/16"-18(M) DEL. PSIG / 2-15 REPLACEMENT 2" GAUGES / G2S; 30 PSI (RL) / G1S; 400 PSI