Model PGR-1 Rev A Pilot Operated Pressure Reducing Gas Regulator; 3" Line Size; Sales Kit A; WCB Steel Body And Cover Dome; SA Trim: 316L Stainless Steel Trim, Neoprene Seat, Neoprene Diaphragm, PTFE Static Seal, Neoprene O-Ring Dynamic Seal, Neoprene Pilot Ball (For 90-200 PSIG Spring Range 316 Stainless Steel Ball) And Diaphragm; OPT-40: Construction Per NACE Standard MR0175