... ethylene-propylene rubber,hypalon,silicone rubber, fluororubber,ptfeSurface Treatment:epoxy resinDrive Way:lever Certification: ISO9001,2008 international quality certification, ... normal butterfly valve.C The surface of this valve uses epoxy resin coating, then it shows more beautiful and its outer ... and the result of gas leak test is 0. E Chose various device drive and installation according to users ...