End greasing frustration with the original locking grease coupler, Locks on, stays on, won't leak. Rated up to 10000 PSI, Easily disconnects, even under pressure. No more broken Zerks, 1/8 in NPT compatible with all grease guns battery, pneumatic, manual, Grease goes in, not on, the machine, Works on all Zerk fittings, SAE and metric, Includes a rebuild kit, The LockNLube is the world's only rebuildable grease coupler. Lowest lifetime cost. Patented Locking Technology. US Patent #8955544, As seen on TruckU on the Motortrend Channel