Model DA1 Rev E Pressure Reducing Regulator; 2" Line Size; Carbon Steel Body With Carbon Steel Spring Chamber; P1 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, Neoprene Diaphragm, BUNA-N Static Seal, Neoprene O-Ring Dynamic Seal; OPT-34: Mates With ASME 600 Raised Face Flanges With 14" Face To Face Dimension; 80-275 PSIG Range Spring, OPT-80: High Outlet Pressure Construction; Internal Sensing