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Glow worm flexicom 30cx auto air vent - how do I replace?

Told by service engineer that vent is weeping lightly when in use . This plus two screws in flu clamp = £240!!!
Ralph, April 2018
The boiler manual will have a detailed step by step guide on how to change auto air vent

But I don't recommend you attempt it

Shop around for lower quotes

?, May 2018
link Click here to see other fixes for 240.