Model PGR-2, Pilot Operated Pressure Reducing Gas Regulator; 3/4" Line Size; Carbon Steel Body And Cover Dome; S2 Trim: 316SST With Buna-N (Nbr) Seat And Diaphragm,;Pilot Has Nbr Ball And Diaphragm,;Stablizer Has Nbr Seat And Diaphragm; NPT Threaded End Connections; 0.75" - 41" Wc Range Spring; Self Contained Sensing, Brass Fittings, Copper Tubing