Model "1000HP" Pressure Reducing Regulator,Graphite/Nbr Gaskets; 1" Size,Gaseous Jet; Wcc Body,Wcb Spring Chamber; S1 Trim: 316SST Cylinder & Plug With Metal Seat,302SST Diaphragm; Npt Screwed; 10-40 PSIG Range Spring; Opt-15: Stellited Seat SuRFace (Includes Opt-14: Integral Seat)