The Original Radon/Sump Dome is designed to cover an existing basin, providing a new heavy duty cover to seal the basin against Radon Gas on odors; to provide adequate safety. There is no reason to dig up your basement or garage floor to remove the existing sump or sewage basin. Simply remove the old cover and install The Original Radon/Sump Dome over the opening, to create a new, completely sealed system. Passive Radon MitigationRetro-fit/repair old sump or sewage basin coversHeavy duty constructionUniversal and easy to install, fits over all installed basinsTop vent, side discharge