... Certification:GB,IEC,ROHS,CE,ISO 3,Powerful fire resistant 4.Delivery need 25days Good Insulativity pipes thick ... :GB,IEC,ROHS,CE,ISO 3,Powerful fire resistance4,Delivery need 25days5,Professional QC 6,Length ... electric shock.2. Dampproof and Acid and alkali resistant: our pipe has the good functions of ... Dampproof and Acid and alkali resistant. It can’t rusting. Each joint will ...