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OTC Ford Diesel Engine Compression Test Adapter is designed for use with OTC's No. 5021 diesel engine compression gauge. This adapter is used to connect the No. 5021 gauge to a glow plug port (after the glow plug has been removed) for performing a compression test. Fits 2003-2006 Ford pickups and vans with 6.0L diesel engines. Similar to Ford 303-757. High-grade materials ensure quality performance over the lifetime of the tool. 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.