Model DA1 Rev E Pressure Reducing Regulator; 4" Line Size; Carbon Steel Body With Ductile Iron Spring Chamber; P5 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, Polyurethane Seat, BUNA-N Diaphragm, BUNA-N Static Seal, BUNA-N O-Ring Dynamic Seal; OPT-30: ASME 150 Raised Face Flanges; 40-125 PSIG Range Spring; Internal Sensing