Where is waterproof casing generally used?

Flexible waterproof casing is suitable for pipeline through the wall where there is vibration or strict waterproof requirements of the structure of the hardware fittings. Flexible waterproof casing through the wall of the wall, such as non-concrete walls should be replaced with concrete walls, and the casing once solidified in the wall; flexible waterproof casing is widely used in construction, chemical industry, steel, water, sewage treatment and other units.
 
Generally when doing the pool to use the casing, it is the pipeline to the pool channel. But the ordinary casing is difficult to seal, so there will be leakage from between the casing and the pipe, and between the casing and the wall is also prone to leakage. If only waterproof casing is used, the leakage between casing and wall is solved, but not the sealing between casing and pipe, and flexible waterproof casing can solve exactly two problems.