Flexible and rigid waterproof casing through the wall of the wall, such as non-concrete walls should be replaced with concrete walls, and the casing must be solidified in the wall once; waterproof casing in construction, chemical industry, steel, water, sewage treatment and other units.
Rigid waterproof casing is suitable for pipeline through the wall does not bear the pipeline vibration and expansion deformation of the building, suitable for pipeline through the wall space is limited or pipeline installation before the building or pipeline updates. For areas with seismic requirements, such as the use of rigid waterproof casing, a flexible connection should be set up near the pipeline entering the pool wall or the building's exterior wall. type A for steel pipes, B,C for ductile iron steel pipes and cast iron pipes.
