Model DA1 Rev E Pressure Reducing Regulator; 1" Line Size; Stainless Steel Body With Carbon Steel Spring Chamber; P4 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, EPR Diaphragm, EPR Static Seal, EPR O-Ring Dynamic Seal; OPT-30: Mates With ASME 300 Raised Face Flanges; 200-450 PSIG Range Spring, OPT-80: High Outlet Pressure Construction; Internal Sensing