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 VPSF-40/50 Ventapipe Air Admittance Valve
Solvent weld outlet for 1½" or 2" BS EN 1329-1:2000 solvent weld waste pipe
Complies with standard: BS EN 12380:2007
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