T3/400

Cones relieving shaft/ascending pipes of inspection and water discharge chambers made from plastics. They are installed centrically around the chamber on an appropriately stabilised substructure. They allow to directly install both traditional and self-levelling manholes and drains and constitute as a structure support for T1 and T2 compensation rings and adapters from TX assortment group placed under manholes and drains. In areas excluded from vehicle and pedestrian traffic they constitute as an element supporting covers securing manholes (T4 type).