The McAlpine VPSF-40/50 Air Admittance Valve is an essential plumbing accessory designed specifically for venting waste pipes in both residential and commercial drainage systems. This high-quality valve is compatible with 1¼", 1½", and 2" BS EN 1329-1:2000 solvent weld waste pipes, ensuring a reliable fit for various installations. This innovative valve allows air to flow into the waste pipe system, effectively preventing the siphoning of water from trap seals and mitigating the risk of negative pressure build-up within the pipes. Equipped with a solvent weld outlet, the McAlpine VPSF-40/50 can be easily connected to your waste pipe using solvent cement, simplifying the installation process. Its compact design makes it perfect for tight spaces where traditional vent pipes may not fit, providing versatility without compromising on performance. With an impressive air flow capacity of 9 l/s and an A1 rating, this air admittance valve is both efficient and effective. Choose the McAlpine VPSF-40/50 Air Admittance Valve for a dependable and easy-to-install solution for your waste venting needs. For further details on Air Admittance Valves, please refer to the information provided below.