... Sino-SouthKorea Joint Venture Henan Changmao Yuanyi Valve Co.,Ltd , we specialize in the enquipment of supplyingand draing ... They are flexible rubber joints, reduced rubber joints, rubber elbows, fan coil joint, sewage check valve rubber, rubber filter, rubber compensator air flue ... air, water, sea water, oil, acid and alkali. Special type used to transport -30 to 250 centigrade of the medium ...