An item that does exactly what it says it will, the McAlpine Air Admittance Valve is a valuable addition to any of your bathroom fixtures and fittings.
McAlpine VP4 Ventapipe 25 Air Admittance Valve with Integral 1¼" Multifit Tee
Ventapipe 25 with 1¼" multifit tee
Complies with standard: BS EN 12380:2013
For use in above ground drainage systems to provide a means of ventilation under conditions of reduced pressure when ventilating pipes are terminated inside buildings in accordance with BS EN 12056-2:2000