40mm OsmaVent Air Admittance Valve - Wavin (White) - 4S303W

A compact air-admittance valve (AAV) for 32 mm or 40 mm waste spigot connection. Made from white ABS plastic, it permits air into the soil/waste stack to prevent siphoning, while sealing tight to stop foul smells. Ideal for installations where traditional venting isn't possible or practical, certified by BBA for reliability.

• Compact, lightweight, and suitable for both residential and commercial use.
• Simple push-fit installation for 32/40 mm spigots.
• BBA-certified for performance and reliability.
• Seals tight to prevent odours from escaping.
• Permits air into drainage systems to prevent trap siphoning.