HL804H/50 Pipe sealing DN50 for sealing vertical pipe penetrations (plastic, cast iron, stainless steel) d 50 mm through ground-contacting floor slabs (foundation slabs, concrete intermediate floors, etc.). The sealing element is designed with two lip seals and a high-quality, factory-welded bitumen collar (500 x 500 x 5 mm) to protect against capillary rising ground moisture.