Model "POSR-2" SALES B KIT; Pilot Operated Pressure Reducing Regulator,Tfe Gaskets; 4" Size; Main Valve - Wcb Body, SST Cylinder, Ductile Iron Bonnet,;Pilot Valve - Ducitle Iron Body & Wcb Spring Chamber,;Mounting Position "H"; S2 Hard Trim: Main-416SST Seat,17-4ph Plug,Pilot-416SST,302SST;Diaphragm;