Wrench is used to remove and install fuel filter elements on 3.2L Diesel Ford Transit engines. Works on 2015 to current 150, 250, and 350 models. The tool is notched to match the canister design to help eliminate slipping and damage to the canister. To remove the canister housing, slip the tool over the canister and turn the wrench to the unlock position on the canister. To install, apply upward pressure and turn the canister housing to the locked position. The tool aslo has a 3/8" square drive to provide extra leverage.