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OTC's 21 mm Injector Nozzle Socket is ideal for removing or installing Bosch KDEL injector nozzles used in John Deere engines. You use the inner socket to hold the nozzle stationary and the outer socket to loosen or tighten the nozzle's gland nut. OTC's tool is an affordable alternative to the hard to source John Deere injector tool. High-grade materials ensure quality performance over the lifetime of the tool. Value is at the core of the OTC tool and equipment portfolio. Whether it’s 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.