The automatic air vent is a pressure safety device in the central heating unit. They work by using buoyancy to release built up air. As water flows through the heating and heating system a float within the aav (automatic air vent) opens or closes dependan
Fits Multiple Appliances
Technical specification
Waist Sizeab25cd11gzTypeAutomatic Air VentToilet Cistern CapacityFTW--Supplier Part NumberACCCOMAAVManufacturer Model NoACCOMAAVBrand NameFirebird