Part of a range of accessories to provide horizontal or vertical extension to a telescopic  underfloor ventilator to accommodate different wall/cavity/brick courses etc.
The vertical extension fits between the upper and lower parts of the telescopic underfloor vent to accommodate a vertical step of more than 5 brick courses (multiple units can be stacked together to achieve required height).

Vertical Extension to Telescopic Vents 1204

SKU: 29751059