Model "DA3" Pressure Loaded Reducing Valve (Series III)-PLPRV; Body Size 2-1/2",Standard Diaphragm Construction; Sales Kit A; Cast Iron Body & Loading Chamber; 17-4ph SST Plug/Cage/Piston,Neoprene Diaphragm,Polyall Seat; Fluorocarbon Elastomer(Hk) Static Seals,Tfe Cap Seal W/Fluorocarbon;Elastomer(Hk) Energizer,Gf-Tfe Wiper;