Model DA1 Rev E Pressure Reducing Regulator; 1" Line Size; Stainless Steel Body With Stainless Steel Spring Chamber; P2 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Neoprene Diaphragm, BUNA-N Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; OPT-31: BSPT Tapered Thread End Connections; 200-450 PSIG Range Spring, OPT-80: High Outlet Pressure Construction; Internal Sensing