pvc fitting for water supply standard: JIS,ASTM, BS All Lipson Fittings( such as PVC reducing socket)are produced from High Precision German-Made Moulds and Injection Machines for Quality Consistency and Superior Product Finishing. Our pipes and fittings can be made, according and conforming to the following internationalstandards:1) American standard (ASTM Sch 40 & Sch 80, SDR 21, SDR 26, SDR41) ...