Product Info Catalog Adhesives Caulk Spackle & Patch Sakrete Leak Stopper Instant Hydraulic Cement, 50-Lb. Sakrete Leak Stopper Instant Hydraulic Cement, 50-Lb. Request a Quote UPC: 764661175506 SKU: 648673 Model Number: 60200700 50 lb, sakrete leak stopper, instant hydraulic cement, a mixture of sand & special additives, for stopping the flow of water through breaks in concrete or masonry walls or floors, can be used to stop leaks underwater.