OTCs Quick Coupler Adapter is ideal for use in fuel injection system testing. Cast and machined brass fitting has a deeply knurled coupler sleeve for easy release. Made in the USA. Sold individually. Value is at the core of the OTC tool and equipment portfolio. Whether its 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 its 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.