20 LB Pail, Hydraulic Water Stop Cement, Rapid Setting, Designed To Plug Leaks Instantly In Concrete & Masonry, Sets In 3-5 Minutes & Can Be Used Above & Below Grade, Use For Blocking Running Water Or Leaks In Cracked Masonry Or Concrete Surfaces, Can Be Used On Swimming Pools, Foundations & For Sealing Around Concrete Pipe.