Model PGR-2, Pilot Operated Pressure Reducing Gas Regulator; 1" Line Size; Carbon Steel Body And Cover Dome; S1 Trim: 316SST Trim With Bc Seat And Diaphragm,;Pilot Has Bc Ball, Neoprene (Bc) Diaphragm,;Stablizer Has Tfe Seat, Neoprene (Bc) Diaphragm; Mates With ASME 150 Flanged End Connections (14" Face To Face); 0.75" - 41" Wc Range Spring; Self Contained Sensing, Brass Fittings, Copper Tubing