Outdoor Air Admittance Valves

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Air admittance valves allow air to enter a plumbing and drainage system when negative pressure starts to build up in the piping system. When this pressure is normalised, the vent closes, stopping sewer gases from entering a building. Here at On-Demand Supplies we stock a wide range of vents, in various sizes and colours, from trusted brands such as McAlpine. 

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