... Material Combinations Body & Cover Ductile: Iron Cast ,Stainless steel , Bronze Available Sizes: DN50-600, DN50-150, DN50-150 ... Retainer &Diaphragm Washer: Ductile Iron, Stainless steel, Bronze Trim: Disc Guide,Seat: Stainless steel, Bronze Seal :NBR, EPDM, HNBR Diaphragm: Nylon ... Nylon Reinforced HNBR Rubber Stem, Nut & Spring : Stainless steel For material options not listed, consult US PLS. Pressure ...