The McAlpine VP50P Ventapipe 50 Air Admittance Valve is a plumbing device designed to allow air into the drainage system while preventing foul odors from escaping. It features a dual-fit synthetic rubber finger seal outlet, compatible with both 3"/75mm and 4"/110mm soil pipes. Manufactured by McAlpine, this valve meets high standards of quality and reliability. Key Features: - Fits 3"/75mm or 4"/110mm soil pipe - Dual fit synthetic rubber finger seal outlet - A1 rated - Air flow capacity of 15.5 l/s