– AIR AND GAS REGULATOR; USE: DIFFERENTIAL PRESSURE REGULATOR SUITABLE FOR BUBBLE LEVEL MEASUREMENT SYSTEM; MAXIMUM INLET PRESSURE: 200 PSI; CONNECTION: 1/4” NPT; PRESSURE REGULATOR KIT COMPATIBLE WITH VFA ROTAMETER; CONNECTIONS, FITTING AND ACCESSORIES IN 1/4” NPT AND 1/8” NPT STAINLESS STEEL; BODY MATERIAL: STAINLESS STEEL 316; BONNET MATERIAL: STAINLESS STEEL 316; WORKING DIFFERENTIAL PRESSURE 3 +/- 0.15 PSI; BRAND 1: CONOFLOW; PART NO. 1: GH21-XTXM-XSX; BRAND 2: DWYER; PART NO. 2: RKA