Model 1171 Rev A Back Pressure Relief Regulator, OPT-5: Cryogenic Service, OPT-45: PTFE Gaskets; 3/8" Line SIze, Angle Design (Two Side Inlets - Bottom Outlet); Bronze Body With Bronze Spring Chamber; B5 Trim: Brass With PTFE Seat, Phosphor Bronze Diaphragm; NPT End Connections; 70-140 PSIG Stainless Steel Range Spring