The Vokera Excell Service Kit, a diverter valve is a part that only appears in combi boilers; it allows the hot water to pass to the central heating system like radiators, etc., or to the hot water system like taps, etc. This feature is what separates a normal boiler from a combination boiler due to the fact that a combi boiler would not need a cylinder to provide heating and hot water.
Fits various Vokera Boilers
Technical specification
Product TypeService KitWaist Sizeab37cj14gzTypeService KitMaterialMixedERP RatingNot ApplicableSupplier Part NumberT0019Brand NameVokera