Model "POSR-2" Pilot Operated Pressure Reducing Regulator,Tfe Gaskets; 2" Size; Main Valve - Ductile Iron Body, SST Cylinder, Ductile Iron Bonnet,;Pilot Valve - Ductile Iron Body & Cast Iron Spring Chamber,;Mounting Position "H"; S2 Hard Trim: Main-416SST Seat,17-4ph Plug,Pilot-416SST,302SST;Diaphragm; Npt Screwed; 10-40 PSIG Range Spring