Griffon HBS-200 Geotextile extension Internal membrane opens under water

Internal membrane opens under water pressure to allow discharge to flow freely and then closes to form a seal to prevent foul odour or sewer gas entering the building

McAlpine Vertical Compression Shower Trap Technical Data Sheet

It has been successfully used for decades to seal water

It does this by introducing air into the waste system and eliminating gurgling

Griffon HBS-200 Geotextile extension Internal membrane opens under waterDESCRIPTION: Elastic cloth suitable for use in combination with HBS 200 Liquid Rubber in case of seam, crack and tear bridging applications. Suitable for sealing and protecting a wide variety of materials, such as concrete, metal, stone, wood, bitumen, zinc, PVC, EPDM (test first), etc. SPECIFICATIONS: Elastic Excellent absorption of HBS 200 Liquid Rubber Strong Non woven.