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This MacValve-3 self-closing waste valve can be fitted in a horizontal or vertical position. The MacValve 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 from entering your building. This MacValve can be fitted in installations where a non-return can be of benefit to your plumbing installation and can be used to take the discharge from a pressure relief valve on an unvented domestic hot water storage system. Because this MacValve has no water seal, it can never dry out through evaporation or lack of use of an appliance as the membrane remains sealed.This MacValve can be fitted in installations where a non-return can be of benefit to your plumbing installation and can be used to take the discharge from a pressure relief valve on an unvented domestic hot water storage system. Because this MacValve has no water seal, it can never dry out through evaporation or lack of use of an appliance as the membrane remains sealed.Features & Benefits: McAlpine MacValve 3 Self Closing Waste Valve, Can be fitted horizontally or vertically, Allows discharge to flow freely and then closes to form a seal, Prevents foul odour or sewer gas from entering the building, Non-return, Takes the discharge from a pressure relief valve, Can be used on an unvented domestic hot water storage system, No water seal Please note: , This self closing waste valve is not recommended for use with shower trays unless there is access for maintenance.. McAlpine MacValve 3 Self Closing Waste Valve White ABS MACVALVE3