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.

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.

Gone are the days of grease squirting out the bottom of the fitting and not going into the zerk fitting. This thing holds tight and forces the grease into the fitting without having to push on it to keep it engaged! Love this thing!

I got this for my m12 grease gun. I use this almost every day to grease tractors and equipment. It works awsome I also got the release valve to help get it off if there is a stuck fitting and just release the pressure. I highly recommend this.

Used it a couple of times and like it. The only worry is that a spare set of jaws are included with the purchase. I’m hoping this isn’t a regularly replaced part. But, I am very happy they included the spare parts.

I have tried a few of the other products and this one actually works. For me the issue was release from the nipple. The cheaper versions would always get stuck and would not release. This one was perfect, it released as it should have. A bonus it came with replacement parts.

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.

This works better than I thought possible. My only regret is not getting one years ago. Save yourself the mess and fuss.