804 Brunnen Kombi-Schaum is resistant to water, oil, petrol, as well as all bacteria and acids normally present in the soil. It is used in the installation of sewer manholes and house sewage treatment plants and for the sealing and assembly of tubbing rings. Foam colour: green. Tested by the Austrian Plastics Institute ÖKI for water tightness at 0.5 bar. SAFETY VALVE PLUS !