The Worcester Bosch automatic air vent is a pressure safety measure for the central heating unit. They work by using a floatation device to release built-up air.
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Technical Specifications
TypeAuotmatic Air VentToilet Cistern CapacityFTW--MaterialMetalColourMixedSupplier Part Number87161405040Brand NameWorcester Bosch
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Worcester Bosch Automatic Air Vent Purger 87161405040