Product Application It's suitable for repairing the straight section of PE, PVC, PPR or other plastic pipes, and used for repairing defects, dents, gouges, corrosion, and leaks in water supply pipes. It is a costly and resource-intensive task and restoring pipelines to their maximum operating pressure without having to replace the entire section. It is new design and very easy to install with water pressure. No need turn off water supply. Shell Body: Ductile iron QT450-10 (GB/T 1348) Shell coating: Epoxy resin powder (Reference to CJ/T120) Rubber gasket: NBR/EPDM (GB/T 21873) Bolt: Grade 8.8 black/stainless steel (GB/T 5783) Nut: Grade 8 black/stainless steel (GB/T 6170)