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Sewer Inspection and Passage Box with Check Valve, an economical 2-in-1 solution. Anti-dengue product, as it does not accumulate water; Easy to install; Lid/grid supports up to 200 kg; Durable, as the material does not degrade or oxidize in contact with water/sewage; Watertight, does not leak, prevents sewage infiltration into the soil; Easy finishing with the floor: square shape; Extensions can be used; Easy to clean, as it facilitates the removal of sediments; Does not use screws for fixing, click system; With check valve that prevents the return of waste, insects and rodents. Check out more on our website: http://www.durin.com.br/ Video Link: • Sewer Inspection and Passage Box...