OTC's No. 7937 GM Transmission Oil Cooler Line Disconnect Tool is specially designed for one handed operation in tight spaces. Simply snap the tool over a 1/2 inch diameter line - with slots facing the fitting - then squeeze and insert the tool, rotating it until it engages the fitting - a 1/4 turn releases the line. Designed specifically for use on GM 2WD and 4WD trucks and vans equipped with 4L60E (1993-2012) or 4L80E (1991-2013) transmissions but also works without modification on many other front or rear wheel drive GM vehicles with at least a 1-1/4 inch clearance between the radiator/transmission and the first bend in the line. This time saving tool eliminates the need to struggle with screwdrivers or picks to release these unique GM lines. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it's a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians' productivity and shop profits.