X. plastic composite pipe may not be directly connected to the hydrant pipe should be used within a dedicated threaded brass fittings. XI. When plastic composite pipe and copper, plastic pipes connected by a dedicated transition joints. XII. When using the internal and external thread dedicated lined transition joints and other materials pipe fittings, steel mesh skeleton when the accessory is connected polyethylene pipe steel pipe, you should take out the ends of the threaded flange embalmed one. With in plastic composite pipe flanges shall comply with the following requirements 3. Flange pressure levels should match the operating pressure of the pipe. Second plastic composite pipe flange connection site shall meet the following requirements: 1. plastic composite pipe cut pipe shall comply with the requirements of this Regulation 6.2.1; 2. mating flange at the site should be used in the plastic-lined convex steel pipe flanges with neck; 3 should twist the plastic composite pipe is connected thread sealing pipe threads, the tooth type should be consistent with current national standard "with thread sealing pipe thread" requirement GB / T7306's; Mine steel reinforced polyethylene pipe steel pipe steel pipe _ _ Golden Link Pipe by pipe Industry Co., Ltd. Hebei Golden Link. Hebei Golden Link Pipe Industry Co., Ltd. (www.hbjinlingpipes.com/) strong, credible, Hebei Hengshui chemical products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Golden Link Pipe and you work into the brilliant, for a better future!