Soil, waste & underground drainage
Black Underground (Kayflow), Air Admittance Valve
Choose the right control fitting for your pipework. Confirm the connection size and intended application with our team.
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A closer look
at the details.
Specifications, finish and suitability should be checked for your particular job.
Product description +
A black underground air admittance valve is designed to regulate air pressure within soil and drainage systems. It allows air to enter the pipework when negative pressure occurs, helping to prevent siphoning of water seals and protecting against foul odours entering the building.
Manufactured in durable black PVC for reliable performance, it is suitable for internal and above-ground soil stack installations. The compact design allows for easy integration into modern plumbing systems, providing an efficient ventilation solution without the need for extended external vent pipes.
Colours, photographs & specifications +
Photos show products from the range and may include other colours. Matched colour photographs are shown where available; they do not guarantee exact sheen or appearance on your screen.
Check dimensions, profile, connections and any required fittings with the team. Compare a physical sample if an exact colour or finish match matters.
- Department
- Drainage
- Range
- Soil, waste & underground drainage
- Available options
- 1
Collection, delivery & your quote +
Add the products and quantities you need to your quote basket. Send your list and any job notes, and we’ll confirm prices, availability and the next steps with you.
Collection is available from our Hayes merchant. For local delivery, include your postcode so we can confirm eligibility, timing and any charges. An enquiry does not reserve stock or place an order.
Collection & delivery details ↗︎