Click to expand Tap to zoom Vaillant 125mm Standard Horizontal Flue Kit 303209 by Vaillant SKU 303209 The Vaillant 125mm Standard Horizontal Flue Kit 303209 is designed for use with the Vaillant ecoTEC Boiler range. The flue kit features a 1000mm length and 125mm diameter, offering a reliable and convenient solution for your home setup. Accessories