Durgo
- Thread starter freefly
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air admittance valve
it lets air into the drain but not out
its a non return valve
fitted above the highest drain level 600mm i think
it lets air into the drain but not out
its a non return valve
fitted above the highest drain level 600mm i think
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- 16 Nov 2003
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Air admitance valve works to let air into soil system without letting fumes out. Works on pressure differences. Kev is right 550 -600mm above highest outlet is correct , (seen them under a bath before though??)
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