The 4TRADE AF110 Push Fit Air Admittance Valve in grey is a high-quality plumbing accessory designed to allow the flow of air into the drainage system without letting out any foul odours. Crafted for durability and efficiency, this valve is an essential component designed to promote better ventilation in your drainage system. Its easy to install with its push fit mechanism, making it a reliable choice for both professional plumbers and DIY enthusiasts.