Concrete often cracks. It is inevitably recognized and experienced. Concrete construction requires construction joints and cold joints All of these unwanted openings in concrete structures may cause very serious problems of water leakage. Most of these problems can be economically solved by utilizing the Pentens High Pressure Injection Systems. Pentens PU-300 one part polyurethane grouting is 100% solvent free and 100% solids. Its have been proven to accomplish two major purposes: one is to stop water leakage permanently, and the other is to maintain or even restore design strength. Slabs on grade, construction or control joints parking garages manholes tanks dams and many other structures can now be fixed permanently. Pentens PU-300 is approved for drinking water contact.