HepVO waste valve 40mm white HepVO waste valve 40mm white The HepVO self sealing waste valve by Wavin is designed to prohibit the escape of foul sewage smells into the air. The hygienic alternative to water-seal traps, the HepVO features a self sealing membrane which works the same without the risk of failure due to evaporation, freezing or siphonage. Ideal for installation in confined spaces, the valve can be fit either vertically or horizontally. Can fit both solvent weld and push-fit pipework Fit under washbasins to free up space Waterless trap which won't dry out Eliminates negative pressure within the waste system by opening and allowing in fresh air Designed to close waste connections below a sanitary fixtures