Suitable for the Viessmann Vitorondens 200-T, Vitodens 100-W & Vitodens 111-W. The flue makes it easy to get around obstructions, and are quick and easy to install. The Vertical Flue Kit consists of: 500mm pipe and an external outlet. Extensions can be added as required PLEASE NOTE: Viessmann Flue Seals for Diesel Boilers (ZK02506) are required with every Viessmann diesel boiler flue system. Please contact KE KELIT Climate Control for more information