The DualSlot HB lid is a concrete lid designed for use in Supermarket Car Parks, Retail Area Car Parks and Light Industrial areas. The edges of the lid are recessed to allow tarmac to be laid up to the raised central slotted section. Whatever size the channel underneath the visible finished area will always be 250mm. The slots in the lid are flared to improve drainage and reduce blockages. The DualSlot HB has been designed for use in tarmac areas.