Model PGR-1 Pilot Operated Pressure Reducing Gas Regulator; 2" Size; SST Body And Cover Dome; Sm Trim: 316l SST Trim, V-Tfe Seat, Fkm Diaphragm;V-Tfe Static Seal, Fkm O-Ring Dynamic Seal,;316 SST Pilot Ball, Fkm Diaphragm; 150 Lb Raised Face Flanges; 15 - 50 PSIG Range Spring; External Sensing, Stainless Steel Fittings And Tubing; Opt-55: Special Cleaning Per Spec #S-1134