This product is the Worcester Bosh Vertical flue kit 100mm. It is designed to be installed with Worcester Bosch Greenstar range. Worcester Bosch Greenstar flue kit helps to take flue gases safely out of a property. Simple push-fit connections form a gas tight seal and in most cases remove the need to cut the flue pipe. No special tools are required when fitting flue extensions as they simply slot into place. Robust, the anti-corrosive design will provide a system that will last the life of the boiler.