the cooler line can then be removed. 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 transmissiontool snaps around cooler line and, when pushed into the fitting, releases the fitting.