these things work great! I am missing the index and middle finger on my left hand. without them it was difficult to get the coupler on the zerk fitting and hold it there while pumping the gun with the other hand. with this locking coupler it has taken the difficulty out of greasing my ranch machinery, sorta' takes away the drudgery of greasing when you know the coupler will stay on the fitting. my machinery gets greased more often now. my neighbor saw mine and ordered 4 for his grease guns....and he has all of his fingers!

With all of the great reviews I thought this would be great. I installed it on one of my Lincoln grease guns and gave it a try. I cleaned off the zerk and clamped the coupler on and then grease shot out from between the coupler and the zerk. THinking it is the zerk, I tried another and the same thing. Then I went over to the tractor and tried those with the same result.
I uninstalled the locknlube and put the stock coupler on and went back and greased all off the fittings with no problem.

The coupler allows easy release of grease gun connection. It works. I needed it as I only have straight shot at the nipple and was unable to get released. The new coupler allow a much easier release (press the release lever)

It's become an essential piece of equipment on my farm. I use it on my rubber hose style gun as my "third hand" and it does that job well. The mechanism can wear, the spare seal kit is there for a reason. The coupler is longer than standard so there are some places it just won't fit-though in some cases that can be fixed by replacint a straight zerk with a 45 or 90 degree zerk.

Holy crap folkz! This is one a them thangs ya don't know ya need until ya get it! We're jus simple country folks so we don't have any special need for this thang. We have a lot a trucks and farm equipment and we try ta keep to a maintenance schedule on em. That is every six months we go out an grease thangs whether they need it or not. Not only that but one a my sons has developed a maintenance business of his own where he goes out ta peoples houses and greases their equipment and checks it out and does small engine work. He says he uses this thang almost ever time he goes out. Now we could use our hand ta hold th fittin on the zerk but that gets old and sometimes ya got them thangs up in places that hard ta get to. If ya can grease it ya can get this thang over th zerk. We ain't found one yet this wouldn't fit. We've just bought a Lincoln grease gun and we're gone write a review on that soon. Now we could'nt justify buyin one a them power grease guns...have ya seen th price on em. So any a you people gripin about much this thang costs are welcome ta go buy a power gun ta make life simpler. We fall in that category where we need somethin ta make our job easier but we don't want ta be haulin around th air-compressor because it just ain't worth it. If you think it's aggravatin ta grease yer machinery then yer probably gone love this thing . And it's well made. This is a real tool. Th grease goes in th joint not everywhere else. If ya want yer greasin ta be simpler and easier get yerself one a these. Holy s***! I almost did a entire review without cussin.