Model "1000HP-1+8" Diff Press Reg,Dbl 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; Opt-32: Schedule 80 Pe Ext Nipples - (Sds Spec Required); 10-40 PSId Range Spring; Opt-12+14+15: One-Step Reduced Orifice,Integral Seat,Stellited Seat;SuRFace; Opt-Bp: Solid Plug For Spring Chamber; Opt-65: Double 3/4" Npt Tapped Spring Chamber