Model "1000HP" Pressure Reducing Regulator,Tfe/Sil. Gaskets; 1" Size,Liquid Jet; Lcc Steel Body & Spring Chamber For Temperatures Down To -50 F; S1 Trim: Metal Seat,316SST Cylinder & Plug,302SST Diaphragm; Npt Screwed; 40-80 PSIG SST Range Spring; Opt-12+14: One-Step Reduced Orifice,Integral Seat