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

The coupler works. I had issues with my old guns coupler sticking on the fitting, it was really irritating. This one goes on easy as it comes off. Heres my only beefs with the thing. A standard coupler allows for a good bit of misalignment before it wont give grease. This system, not so much. You have to be pretty darn on it to get the grease in. Sometimes it looks like its on so you give it a pump and grease just gets all over the fitting. Mildly irritating. Other issue, a decent amount remains in the head of the fitting when it disengages. For some reason, it seems to spit up more than a regular fitting. As long as you give it a second for pressures to even out before removing it typically is pretty controlled but last time I was greasing I went a little too quickly and made a mess.

Works perfect.

Would not want to own a piece of equipment without having one of these. Works great.

This item works great! Allows you to use two hands on the grease gun, not having to hold the hose end on the fitting.

This is great , no more pulling and fighting to get the zerek released.

Very happy so easy to use

Worked great. Not once did it slip off the zerk nipple

My husband says he couldnt lube our tractor without this as he has 32 ports to do and it would really make his hand hurt.

Works very good, just very pricey.

This grease coupler works great on zerk fittings that have plenty of room around them! However, theres tight quarters as I encountered with a Cub Cadet front axle bearing, and I was forced to remove the LockNLube and install a standard end on the grease gun hose. Theres a good possibility that an extension of some type may be available that snaps into the LockNLube; but Im just not aware of it at this time. Again, my intentions are to not take anything away from the quality of this excellent coupler.