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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 normalized, 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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ESDA Ltd (Trading As On-Demand Supplies)
Churcham Business Park
Churcham
Gloucester
Gloucestershire
GL2 8AX
UK