Keep channels using slot tops clear of leaves and debris by installing the maintenance unit. The two-piece galvanized steel unit works alongside the slot top drain grate and has an asymmetric slot to match the slot top drain grate. The maintenance unit provides easy access inside the unit for cleaning and maintenance. Use two Opening Tools for Maintenance Unit (SKU 13399) to remove the inside box nested inside the outer box to remove particles. ADA compliant and heel proof.