PVC PUDDLE FLANGES are to be welded on pipes going through concrete structures. Pipes passing through concrete usually do not bond well to the concrete, and water might run on the external surface of the pipe. Our flanges, when welded onto the pipes, have uniquely designed ridges on the surface to act as a barrier for water when pipes pass through retaining walls of cast-in structures, and this can help prevent leakages effectively.Puddle Flanges securely seal pipes and cables made of plastic, steel, fibre cement and vitrified clay against a high water column. The bushings in concrete foundations and walls are securely sealed against groundwater and pressurised water.