When big machines demand big grease, this coupler delivers. Locks onto 5/8" button head fittings and connects to any standard grease coupler. UPDATED DESIGN! Easily connects to your LockNLube Grease Coupler or any standard grease coupler. Fits 5/8" button head fittings. Eliminates the need for a dedicated button-head grease gun. High-flow design for heavy-duty applications. Connects to LockNLube or standard grease couplers. Fast connect and release. Ideal for construction, agriculture, mining, forestry, and industrial equipment. Great for track adjusters, loaders, excavators, and machinery with large grease volumes.