PVC pipes are smooth to outside and inside, standard ... Plastics CO.,Ltd.) that produce plastic fittings (PPR / PVC fittings), plastics ball valves, plastic taps and mould, ect ... cooperate.Best Regards,Zhuoxin Group.1.The sizes of PVC pipes PVC inside (mm)SIZEDiameter CNS standardJIS standardDIN standardANSIBS(inch ... 5110±0.37.1±0.5114.3114.32.PVC pipes advantage1)PVC pipe is low in wasted energy, it's ...