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Locks Stays in place. Will Not Leak. Patented locking jaws adhere to the Zerk to create a secure connection that won't come loose under pressure. Allows genuine hands-free lubrication so that grease penetrates into the fitting, not onto your machine. Extra reach for recessed fittings: 8.9 cm extended reach to access shielded power take-off shafts, U-joints, axles and other hard-to-reach grease fittings where standard couplers cannot fit. Rated at 10,000 PSI. Designed for demanding shop maintenance, fleet, agriculture and heavy equipment applications. One-handed thumb release even under pressure. Disconnect easily without struggling with stuck couplers or damaging grease fittings. FULLY REBUILDABLE DESIGN - Internal components can be replaced to extend the service life and reduce replacement costs. Rebuild kit sold separately.