The Ravenheat Gasket 60mm Dia. Flue 0014GUA06005/0 is located around the flue section. This flue vent allows the safe expulsion of steam and noxious gases resulting from the boilers normal operation. If you are looking for a particular part then make sure you get in touch with the BH Spares team for more information about this product and how we can help you with your heating system.