Absorbing manholes are manholes made from Drenopal slotted corrugated tube.
The slots provided around the circumference of the riser disperse stormwater into the ground.
Diameters normally used in this application are ND/OD 1000 (inner diameter of 855 mm) and ND/OD 1200 (inner diameter of 1024 mm).
A number of accessories are also available, such as a tapered adapter, closure plate for the base of the manhole and couplings.