Two Sizes, 3/8" and 1/2", are Designed to Disconnect Transmission Oil Cooler Lines on Ford Vehicles. The tools have a special stepped design to fit connectors. Simply push the line toward the connector, then engage tool and pull line from connector. Use 3/8" disconnect for 2003 - 2010 Ford V8 Explorer, 2004 and later Ford F150 and Cadillac CS. Use 1/2" disconnect for Ford Super Duty Trucks, F250, F350 and F450.