Prevent vandalism and deter theft with the Grate Locking Device. This security accessory works with the BG-FILCOTEN® 100 trench drain line to secure the drain grate onto the integral frame of the channel or catch basin. The Locking Device straddles the width of the channel and connects to both sides on the inside. The channel drain grate is placed on top and fastened using the anti-theft bolt (included) through the center of grate and into the locking device. When the bolt is tightened, the unique winged design of the Locking Device will open and lock into cut-outs inside the channel for a secure hold.