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.

I bought this to replace the wonky coupler on a Performance Tool grease gun I bought new recently. This item installed easily, and seems to be well made. Now, if you have heavy equipment, or farm equipment, I can see where this would be a major time and aggravation saver. For automotive stuff I would urge caution. It simply will not lock on to the zerks on my u-joints on a 2002 Ford F-150. The coupler is too fat. I will have to remove one of the 12mm bolts on the yoke to be able to lock this on. In other words if your zerk is a straight shot this will work, in a tight spot its width (and longer length than an ordinary coupler) will work against you. I gave it five stars because on ball joints, and tie rod ends its the bomb! For that alone its worth it to me. Some things under a truck are difficult to hold a ordinary coupler and pump the grease gun at the same time, thats where this product shines.

I was ready to give up and could not figure out why the grease wouldn't go into the fitting. I bought two grease guns and neither worked. My last hope was buying this thing and it was kinda pricey but not more than any alternative and it worked perfect right away.. this thing is awesome

Gripped on tight to the bulging zerk and didn’t let go till she was filled. Gets er greased up good! Works great!

This is what all good grease guns should come with. Works flawlessly a it should. No wasted grease because the coupler comes off. Even stalling the grease gun on a blocked fitting still allows for easy removal.Top of the line product.

Worked excellent on auto grease fittings but on my boat fittings it couldn't seal and get grease in. Maybe the boat zerks are too old but grease didn't go in just went all over the outside but overall seems to be a very nice piece.

Just get it. Don't even think about it. A little pricy but saves so much frustration. Used it on my 38 year old sterndrive; four fittings, narrow galleries. Takes a lot of pressure to load. All four took grease, no problem. No leaks, no mess. Clamped on easy. With the original coupler on my grease gun (made in...guess) grease just shot out side.

This is a great product that stays on the zerk fittings. You can lock on those hard to access zerks and then use both hands to pump the grease. While most zerk fittings are no big deal there are always a few that are harder to access and pop off as you pump. This even makes using a powered grease gun a real viable option too as other fittings seem to pop off when the grease goes in under pressure. I think the product is super over priced but being that no other product solves the problems this does unfortunately I have to recommend it. It’s at lest seems to be a high quality build! But if you see this at $20 or $25 buy it. $40 seems just to be expensive IMO but even at that price I would buy it again.

Where has this been all my life? Excellent fitting. All grease guns should come with this or similar fitting. It simply works. I thought I was doing something wrong all the years of my life. I could never get grease INSIDE the zerts fittings, always all around the outside. This is worth the expense, take my word for it and thank me later.