CHINNA HNMason Pipe Fittings Co., Ltd.Since its establishment in 2001, CHINA Mason has been a vibrationand noise control specialist serving the market of manycountries.Our main products include flexible flanged rubberexpansion joints,dismantling joint,metal expansion Joints, fabricexpansion joints.zhengzhou Mason has passed ISO9001:2008,ABScertification, and has self-supported import and export right.