... and Draining of Water Materials Comapny and Sino-SouthKorea Joint Venture Henan Changmao Yuanyi Valve Co.,Ltd , we specialize ... joints, reduced rubber joints, rubber elbows, fan coil joint, sewage check valve rubber, rubber filter, rubber compensator ... pipe expansion joints, bellows, waterproof sleeve tube, power delivery Joint, limit expansion joints etc.Registered trademark "Changmao" brand, ...