Model 1000HP Rev A Pressure Reducing Regulator For Standard Service; 1" Line Size, Gaseous Jet; Stainless Steel Body With Stainless Steel Spring Chamber; S2N Trim: 316 Stainless Steel Cylinder, 416 Stainless Steel Plug With Metal Seat, Neoprene (BC) Diaphragm; OPT-30: Mates With ASME 150 Raised Face Flanges; 100-300 PSIG Range Spring; OPT-25S: Stainless Steel Rain-Proof Bug Vent (Includes OPT-25: 1/4" NPT Spring Chamber Vent Tap)