Model "DA4" Pressure Loaded Reducing Valve (Series IV)-PLPRV; Body Size 3",Standard Diaphragm Construction; Sales Kit A; Cast Iron Body & Loading Chamber (6" Size Uses Steel Loading Chamber); P Trim: 17-4ph SST Trim With Polyall Seat,Neoprene Diaphragm; Buna-N(Nbr) Static Seals,Tfe Cap Seal W/Buna Energizer Dynamic Seal,;Gf-Tfe Wiper;