High quality Anti-sweat worm gear butterfly valve 1.19years experience 2.low leakagerate,high ... quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear ... gas, oil, etc. Drive type Manual, worm worm gear drive, gas drive, electric drive. Part name Material Body ... ring all kinds of rubber Characteristics of Product: 1.Small in size and light in weight and ...