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