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Historically, older sanitary manhole covers were produced with large open pick holes plus vent holes to facilitate the dispersal of sewer gases. These large openings allowed storm water to enter into the sanitary system. Modern civil engineering practices dictate that sanitary collection systems be designed to allow only sanitary sewage flow in the pipelines, leading to a safer and more cost efficient sewage treatment system. Whether you need help with surface water infiltration, odor & gas control or security, EJ has the products and solutions to fulfill your needs.
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