OTC 6593 Transmission Disconnect Set for Ford Tool snaps around cooler line and when pushed into the fitting releases the fitting The cooler line can then be removed 3/8" disconnect is used on 2003 - newer Ford Explorers with the 5R55W transmission 1/2" disconnect is used on 2003 - newer Ford Super Duty Trucks with the 4R100 transmission Similar to Ford Numbers 307-441 and 307-459