Description Access Extensions and Covers are custom roto-molded using high-density polyethylene with U.V. inhibitors. They feature a stop-bead and backup dam along with a custom Nitrile rubber gasket to ensure a water-tight seal. Secure seals prevent contents from escaping tank and prevent excess rainwater from entering and flooding tank. This protects both your drinking water and your property!Description - 16" Access Extension - BlackWeight - 35 PoundsDimensions - 32.5 x 16