Features and Benefits: Snap around cooler line, push into the fitting, fitting releases, the cooler line can then be removed; 3/8″ disconnect is used on 2003-newer Ford Explorers with 5R55W transmission; 1/2″ disconnect is used on 2003 – newer Ford Super Duty trucks with the 4R100 transmission; Tool snaps around cooler line and, when pushed into the fitting, releases the fitting. The cooler line can then be removed.3/8 in.; disconnect is used on 2003 – newer Ford Explorers with the 5R55W transmission. (Similar to Ford No. 307-441.)1/2 in.; disconnect is used on 2003 – newer Ford Super Duty Trucks with the 4R100 transmission. (Similar to Ford No. 307-459.)