Difference between rigid waterproof sleeves and flexible waterproof sleeves

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A rigid waterproof sleeve is a steel pipe equipped with flange rings (ring-shaped components made of steel that are fitted around the pipe), and it is installed within walls (usually concrete walls). It is used for allowing ordinary pipes to pass through walls, thereby helping to ensure the waterproofing of those walls； In addition to the external flange rings, flexible waterproof sleeves also have internal components such as retaining rings and flange threads. They are available as complete sets, or can be fabricated manually, and are used for pipelines that require shock absorption, such as those connecting to pumps when passing through walls. The main difference lies in their practical applications: flexible waterproof sleeves are primarily used in areas with high requirements such as civil defense walls and water tanks, while rigid waterproof sleeves are generally used in basements and other locations where pipes are needed. Pipes entering a building from below require the installation of rigid waterproof sleeves when passing through the exterior walls of the building. Casing for passing through walls (pools, panels, etc.) is divided into rigid and flexible types; those that allow for deformation after installation are flexible ； No deformation is allowed – rigid