Model 1000HP-1+6 Diff Press Reg,Sgl Diaph,Graphite/Nbr Gaskets; 1/2" Size,Gaseous Jet; Ductile Iron Body & Spring Chamber With Closing Cap; S40v Trim: 316SST Cylinder,316SST Plug With Fluorocarbon Elastomer;Seat & Diaphragm; Npt Screwed; 10-50 PSId Range Spring; Opt-56: Special Clean Per Spec S-1542