Model 1000HP-1+6 Diff Press Reg,Sgl Diaph,Graphite/Nbr Gaskets; 1" Size,Gaseous Jet; Wcc Body,Wcb Spring Chamber With Closing Cap; S1 Trim: Metal Seat,316SST Cylinder & Plug,302SST Diaphragm; Npt Screwed; 65-100 PSId Range Spring; Opt-65: Double 3/4" Npt Tapped Spring Chamber