Model DA1 Rev E Pressure Reducing Regulator; 1" Line Size; Carbon Steel Body With Carbon Steel Spring Chamber; P8 17-4PH Stainless Steel Trim, 316L Stainless Steel Cage, GF-TFE Seat, Fluorosilicone Diaphragm, Fluorosilicone Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal; OPT-30: Mates With ASME 300 Raised Face Flanges; 200-450 PSIG Range Spring, OPT-80: High Outlet Pressure Construction; Internal Sensing; OPT-25S: Stainless Steel Rain-Proof Vent (Includes OPT-25: 1/4" NPT Spring Chamber Vent Tap)