This kit stops water leaks around your foundation's water line or pipe. Hydraulic cement is used to seal the void around a water line or pipe. Eventually this fails. Applied Technologies' Waterline, Pipe and Penetration Kit fills the void with fast acting Hydra Stop 300 polyurethane foam to make a closed cell polyurethane foam around your pipe. The foam will penetrate the entire width of a 8” concrete foundation. The Hydra Stop 300 expands and fills the void around your pipe or water supply line. For use on concrete foundation and basement walls only.