<p>The RadonSeal DIY Foundation Concrete Crack Repair Kit stops water leaks through hairline or large cracks in concrete foundation walls using state-of-the-art low-pressure injection.</p><p><b>NO DRILLING REQUIRED!</b></p><p>A complete crack injection kit for homeowners or contractors. Only a conventional caulking gun needed for injection.</p><p>Our commercial-grade, two-component polyurethane forcefully expands and permanently fills the entire crack (up to 22-inch. thick walls). The closed-cell foam is impervious to moisture and soil gases, including radon. Tenaciously bonds to dry or wet concrete but remains flexible to allow for its natural movement. The crack will never leak again, unlike caulk or hydraulic cement. Enough to seal up to 10 linear ft. of cracks in poured concrete.</p>