Stonehands Kilpauk, Chennai, Tamil Nadu

Forms the foundation of the EcoBloc maxx K system

The GRAF Infiltration Tunnel System consists of interlocking tunnels and end plates, injection-moulded from recycled polypropylene.The tunnels are designed so that they lock together longitudinally, and are pre-marked on the top for cut-outs 100 and 200 mm in diameter. The end plates are pre-marked to enable 100, 200 and 300 mm diameter holes to be cut. Items used with the units to form a stormwater management system but can also be used for: •฀ surface water connection pipework •฀ permeable geotextile and fleece •฀ air vent and ventilation pipework •฀ silt trap •฀ infiltration inlet modules •฀ flow control/chamber devices.