LockNLube Grease Gun Coupler locks onto Zerk fittings. Grease goes in, not on the machine. World’s best-selling original locking grease coupler. Rated 10,000 PSI. Long-lasting rebuildable tool.

LOCKS ON, DOES NOT LEAK: Grease goes in, not on the machine. LockNLube’s unique sliding sleeve ensures that when the jaws are locked onto the Zerk, a leak-proof seal is created.
ONLY REBUILDABLE COUPLER: All LockNLube couplers include a rebuild kit! Simply replace the seal and jaws and it is as good as new = lowest lifetime cost.
COMPATIBLE WITH ALL GREASE GUNS AND ZERK FITTINGS: 1/8″ NPT works with all grease guns and manufacturers – pneumatic, manual, or electric. Locks on to all Metric and SAE specification Zerks.