... Draining of Water Materials Comapny and Sino-SouthKorea Joint Venture Henan Changmao Yuanyi Valve Co.,Ltd , we specialize in the enquipment ... media resistance and climate , also called rubber joint,soft joint,shock absorber,tube vibration isolator,pipe shock absorber ... Cost are key indicator when pruchase products ,sino south korea joint venture obviously introduce ur advanced and leading technology ...