... DN1200) water supply, gas supply pipe, PP-R Jiangsu Zhanwang Pipe Co., Ltd., located in No. ... researching, manufacturing and selling HDPE double-wall corrugated pipe of all types, HDPE (from type DN20 ... to type DN1200) water supply, gas supply pipe, PP-R (from type DN20 to type DN160) ... & hot pipe, PE-RT floor heating pipe and all pipe fittings, with annual sales of pipes and pipe fittings 50,000 ...