Model "1000HP" Pressure Reducing Regulator,Graphite/Nbr Gaskets; 1-1/2" Size,Gaseous Jet; Ductile Iron Body & Spring Chamber; S1 Trim: 316SST Cylinder & Plug With Metal Seat,302SST Diaphragm; Npt Screwed; 80-225 PSIG Range Spring; Opt-15: Stellited Seat SuRFace (Includes Opt-14: Integral Seat)