Model PGR-1 Rev A Pilot Operated Pressure Reducing Gas Regulator; 1" Line Size; Stainless Steel Body And Cover Dome; SN Trim: 316L Stainless Steel Trim, PTFE Seat, Fluorocarbon Diaphragm, PTFE Static Seal, Stainless Steel/PTFE U-Cup Dynamic Seal, 316 Stainless Steel Pilot Ball, Fluorocarbon Diaphragm; ASME 150 Raised Face Flanged End Connections; 15 - 50 PSIG Range Spring; Self Contained Sensing, Stainless Steel Fittings And Tubing; OPT-55: Cleaned For Oxygen Service Per Cashco Specification S-1134