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
Fits a number of Worcester Appliances
Technical specification
Waist Sizeaa98ci13gwToilet Cistern CapacityFTW--ERP RatingNot ApplicableSupplier Part Number87161570290Brand NameWorcester Bosch