Model DA2 Rev E Differential Pressure Reducing Regulator; 1" Line Size; Stainless Steel Body With Stainless Steel Spring Chamber, 1/8" Petcock Vent; SN 316L Stainless Steel Trim, PTFE Seat, Beryllium Copper Diaphragm, Stainless Steel/PTFE U-Cup Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; OPT-30: Mates WIth ASME 150 Raised Face Flanges; 70-200 PSID Range Spring; Internal Sensing; OPT-65A: 1/4" NPT Double Tapped Spring Chamber