Get easy access for cleaning and maintenance inside Dura Slope® Channel Drains that use slot top grates by installing the removable Maintenance Unit. The galvanized steel box works with the slot top channel drain grate and can be lifted to access the Dura Slope channel to remove blockages which can affect drainage performance. Maintenance Units can be filled with bricks, concrete, or asphalt during installation to blend into the surroundings. They should be installed at the beginning and end of the drain run and at intervals of approximately 100 ft.