McAlpine Space Saving Self Closing Valve 1 1/2" White WV-1

The McAlpine WV-1 Space Saving Self Closing Valve delivers intelligent odour prevention through a precision-engineered internal membrane system. Designed for 1 1/2" waste installations, this white valve opens automatically under water pressure to permit discharge flow, then seals closed to block foul odours and sewer gas from entering the property. The membrane-based design removes the traditional water seal, preventing evaporation failures in infrequently used installations. The valve responds to negative pressure by drawing air into the discharge pipe, eliminating the need for secondary ventilation and allowing greater plumbing design flexibility. The compact 75mm overall height maximises usable storage space below basin installations within cupboards and furniture. The valve features tool-free disassembly for straightforward cleaning and maintenance, with KIWA approval confirming compliance with recognised plumbing standards. Features & Benefits: Internal membrane opens under water