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This MacValve self-closing waste valve can be fitted both horizontally and vertically. The MacValve membrane opens under water pressure to allow discharge to flow freely, then closes to form a tight seal that prevents foul odours or sewer gases from entering the building. This MacValve can be fitted in many installations where a non-return is beneficial and can also be used to take the discharge from a pressure relief valve on an unvented domestic hot water storage system. When this MacValve is installed horizontally, the flow arrow must be in the uppermost position. Features & Benefits: McAlpine MacValve Self Closing Waste Valve - 1 1/2 inch, Membrane remains sealed, For installations where a non-return is beneficial, Fits horizontally or vertically, No water seal to prevent dry out through evaporation or lack of use, Size options available Please note: , This MacValve self-closing waste valve is not recommended for use with shower trays unless there is access for maintenance.. McAlpine MacValve Self Closing Waste Valve - 1 1/2 inch White ABS Plastic MACVALVE-2