ring joint gasket SIZE:DN15-DN1600 TYPE:OVAL SECTION ,OCTAGONAL SECTION ring joint gasket1.Standard :ANSI B 16.5-1973. HG20612-1997.JPI-75-15-70, GOST 26.260.461-992.Pressure :PN10,PN25,PN40,PN64,PN2003.SIZE:DN15-DN16004.TYPE:OVAL SECTION ,OCTAGONAL SECTION5.Material: Stainless steel 304/321/316,steel 10#,steel 20#,16MN6.Processing technic :Forging7.Packing: in wooden case8.Surface treatment:Rust ...