What are the characteristics of waterproof sleeve through the wall?

Make steel casing or iron casing for drainage pipes through the floor and internal walls.For example, a DN100 bushing is a DN150; where the kitchen and toilet drains pass through the floor without bushings.
When the pipe through the wall and floor with metal casing or plastic casing, the top of the casing installed on the floor should be 20 mm; above the decorative floor. Rigid waterproof casing is an auxiliary but indispensable equipment for the plumbing industry.
 
The top of the casing installed in toilets and kitchens shall be 50 mm higher than the decorative floor and the bottom of the casing shall be level with the floor.
Installed in the wall casing end and finish must be flat, casing and the floor between the cracks of the pipe must be filled with fire-retardant dense material, waterproof grease and face must be smooth.
The gap between the casing and the pipe through the wall shall be filled with fire-retardant and dense material, the face shall be smooth, and the interface of the pipe shall not be located in the casing.
 
Rigid waterproof casing is suitable for limited space or pipeline installation through the wall before construction or pipeline renovation, for buildings without pipeline vibration and structural expansion deformation. Steel waterproof casing is a steel pipe outer wing ring, installed on the wall (mainly concrete walls), for waterproofing through the pipe wall; flexible waterproof casing in addition to the external wing ring, there is a gear ring, such as the flange inside, with a complete set of sales set, can also be used for shock-absorbing pipes, such as through the pipe wall with a pump connection.