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 complex cooling and heating system a float within the automatic air vent opens or closes depend
Colour: Black
Fits multiple Vaillant Boilers
Technical specification
Waist Sizeac59cg94guTypePressure Relief ValveToilet Cistern CapacityFTW--Supplier Part Number20107722Brand NameVaillant