... black OR others on request 3,Standard: GB/T13663-2000 4,Certification: ISO5,Connection: socket fusion joint,butt fusion joint,electro ... Applications: 1,water supply2,industrial liquids transportation 3,sewage treatment 4,gas supplyAdvantages:1,Non-toxic: no heavy metal additives, would not ... costs by as much as 50% over metal piping system 4,Higher Flow Capacity: smooth interior walls result in lower ...