... Water Materials Comapny and Sino-SouthKorea Joint Venture Henan Changmao Yuanyi Valve Co.,Ltd , we specialize in the ... pipe expansion joints, bellows, waterproof sleeve tube, power delivery Joint, limit expansion joints etc.Registered trademark "Changmao" brand, ... high media resistance and climate , also called rubber joint,soft joint,shock absorber,tube vibration isolator,pipe shock absorber ...