The McAlpine VP15M Ventapipe 15 Air Admittance Valve is a plumbing device designed to allow air into the drainage system while preventing foul odors from escaping. This valve features a 1¼" universal outlet, making it compatible with various pipe sizes and materials, suitable for waste pipes from sinks, basins, baths, and similar fixtures. Manufactured by McAlpine, a reputable brand in plumbing, it meets high standards of quality and reliability and is backed by a manufacturer's guarantee. It offers an air flow capacity of 0.5 l/s.