Manhole Rehabilitation - Cretex Specialty Products LSS Internal Manhole Chimney Seal

The LSS Internal Manhole Chimney Seal from Cretex Specialty Products is a high-performance, watertight 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 and snowmelt, clear water enters manholes through deteriorated or broken frame-chimney joints. This deterioration can be caused by frost heave, soil movement, traffic loading, thermal expansion and contraction of the surrounding pavement, and poor or antiquated construction methods. Each seal is made up of an EPDM sleeve and type 304 stainless steel expansion bands, and 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 up to 24 vertical inches with a single seal. 800/345-3764;


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