Potterton air pressure switch is a safety device which checks that the fan is fully operational. It ensures that if the fan within the boiler fails, toxic gases do not accumulate with no way of venting them.
Fits a number of Potterton appliances
Technical specification
Waist Sizeaa84cc13gtTypeAir Pressure SwitchCompatible WithSuprima 100 and Suprima 80Supplier Part Number642228Brand NamePotterton