... Flexible convenient use , Toughness, good ductility 2 . material : PVC and stainless steel or carbon pipe coupling 1 . Flexible convenient use ... , Toughness, good ductility2 . material : PVC and stainless steel or carbon 3 . size : Wide type selection , customized ... , non poisonous , antifriction, aging resistance, high temperature resistance. stable and reliable performance .