Waterproof CAP is a by high-energy ion radiation processing of polyethylene material, appearance is cap-like, by polyethylene pipe expansion forming Hou covered one layer hot melt rubber film and into, waterproof CAP has high of mechanical strength, resistance aging sex, resistance environment stress cracking, and sealed performance good, features, has more long of using life, the products applies Yu various specifications of polyurethane foam insulation tube end head waterproof and protection.