1)Material:silica gel,NBR,EPDM... 2)Size:accprding to valve size butterfly valve Gasket,valve seal,valve sealant,rubber gasket butterfly valve Gasket,valve seal,valve sealant,rubber gasket1)Material:silica gel,NBR,EPDM...2)Size:accprding to valve size3)color:red.blue,balck,white,or as request valve rubber Gasket