... inside and outside 250umSize: D50-2000mmPN10/16 Dalian Wantong Industrial Equipment Co., Ltd. (WTIE) was established in 1992 as a sub- ... production process, from 1995 Dalian Wantong started to provide technology, know-how as well as whole set of production ... pipes and fittings for water networks, pipes and fittings for industrial systems, valves, castings, machines etc., which are widely used ...