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Give your sewer treatment system the upper hand with powerful manhole inserts from No Flow In Flow in San Antonio, Texas. For more than 25 years, our manhole inserts have eliminated sheet flow of rainwater into the sanitary sewer system. Made of a high-tech, next-generation polymer resin, our rain dishes offer you an extended life of outstanding performance and profitability. Prevent the infiltration that produces unsanitary water and eliminate the extra costs at your treatment plant with a small and affordable investment in our unique, revolutionary inflow protectors.