Cretex LSS Internal Manhole Chimney Seal is a mechanical seal installed on the frame and grade ring sections of sanitary sewer manholes.

These seals eliminate and prevent manhole frame-chimney inflow. During wet weather, clear water enters manholes through deteriorated and broken frame-chimney joints, which may burden the collections system.

Each seal is made up of a high-grade rubber sleeve and stainless steel expansion bands, which can be easily removed and reinstalled to allow for future manhole adjustments.

It has a 50-year design life and is available in four widths, allowing complete chimney coverage of up to 24 vertical inches with a single seal.

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