Model PGR-1 Rev A Pilot Operated Pressure Reducing Gas Regulator; 1" Line Size; Stainless Steel Body And Cover Dome; SM Trim: 316L Stainless Steel Trim, PTFE Seat, Fluorocarbon Diaphragm, PTFE Static Seal, Fluorocarbon O-Ring Dynamic Seal, 316 Stainless Steel Pilot Ball, Fluorocarbon Diaphragm; ASME 150 Raised Face Flanged End Connections; 15 - 50 PSIG Range Spring; External Sensing, Stainless Steel Fittings And Tubing; OPT-86: System Supply Gauge For Stabilizer Outlet; OPT-25S: Screen For Spring Chamber Vent; OPT-55: Cleaned For Oxygen Service Per Cashco Specification S-1134