Concrete Manhole Adapter Seals (WATERSTOPS) (CMA) help eliminate leaks around pipe entering manhole walls, yet are flexible enough to permit pipe movement without destroying seal integrity. It is particularly useful for pipe to which concrete will not adhere, such as plastic pipe. The CMA, made of elastomeric plastic, is corrosion proof and is unaffected by acid or alkali. However, the CMA is subject to many various conditions beyond the manufacturer’s control, and its effectiveness as a seal is directly related to the quality of the grout, workmanship and field conditions under which it is installed.
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