Timloc 1204 is a vertical extension sleeve for underfloor vents. Timloc 1204 fits between the upper and lower parts of the telescopic underfloor ventilator to accommodate a vertical step of more than five brick courses.
 
Timloc 1204 benefits:
Does not restrict airflow through the main telescopic underfloor ventilator
Eliminates the need for on site modifications
Lightweight and easy to handle
Durable and totally resistant to decay