This 110mm white air admittance valve is designed for use in soil systems where conventional venting is not possible. Made from PVC, it is suitable for use with plastic soil pipe installations in residential plumbing applications.
Fitted to vertical soil stacks, the valve allows air entry when negative pressure occurs, helping to prevent the loss of water seals in traps. It is commonly used in lofts, bathrooms, and other spaces where venting through a roof is impractical.
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