This 970mm flue extension from Vaillant is ideal for use with compatible flues and is commonly used in vertical flue installations. It increases the length of a standard flue pipe, providing more control over where a plume releases from a property. The flue extension is quick to install due to simple push-fit connectors and is designed to blend in with the rest of the boiler system. When used between flue elbows, a vertical adaptor, and a vertical terminal, this Vaillant 80/125 flue extension provides more flexibility during installation by enabling you to extend the length of the flue system by up to 970mm. It is compatible with Vaillant EcoTEC commercial boiler models.