Product detail inside: titanium coil titanium tube material seamless tube titanium tube diameter 12.7mm----30mm(normal use) titanium tube thickness 0.55mm----3.0mm(normal use) outside: PVC case PVC cover material enviromental protection PVC tube diameter OD110mm----OD400mm PVC tube thickness 2.7mm----15.3mm connection gas inlet and outlet titanium thread and copper nut/tube water inlet and outlet plastic piston testing/others water pressure 0.25----1.0Mpa(2.5---10bar) gas pressure 3.5Mpa PVC temperature 45°C shell leakage no tube leakage no pack 0.6mm thick gray sponge corrosive or not anti-corrosion use pool /heat pump/ air conditioner/chillar etc