It is a device that allows you to reuse an existing vertical or horizontal sideways hole through the external wall of your property when replacing a boiler with a Greenstar 4000 boiler. It is a time-saving accessory that eliminates the need to drill a new flue hole, and it provides the perfect offset kink to allow for the correct alignment of the boiler with the existing flue.

• Quick and easy replacement of old Greenstar i Junior and Si combi boilers, no need for core drilling.

• Provides the perfect offset kink to allow installers to reuse existing flue holes through the building fabric.

• Made of high-quality materials and is designed to withstand the rigours of everyday use.