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.

Tool functions as per description

Good idea

I bought this grease coupler for one fitting but it is a royal pain to access. I’ve struggled for years using a regular coupler and what a mess. So I sprung for this coupler and, like magic, it locked on that fitting and I pumped in the grease. Of course I will use the coupler anytime I need to grease other joints with a fitting.

This is great and makes greasing zerk fittings super quick and easy. Get it!

These work great

*update* after posting my original review I was contacted by the company and made aware that a seal kit comes with the coupler and it should fix the leak. I had either lost mine or had not received it and they immediately shipped me another at no charge! I farm so after receiving this I immediately put it to use on equipment and it was amazing! It stuck to the zerk and you could go hands free with the electric gun making it great for small places like the tracks on a tractor. It worked great for about 3 months and now it leaks all over. For the price this should have last much longer so I am very disappointed in it mostly because if it did work I would pay a lot more for it.

Bought this back in 2017. Tried it maybe a few dozen times over the years. Never been able to get it to reliably seal on the zerk so 9 times out of 10 the grease just flows out the end, around the zerk, instead of into the bearing. Tried it again the other day: same leak. Have 4 other guns with regular couplers so tried each of them on the same zerks. They all worked fine so I know the zerks are good. Too bad because seems like it would be a good idea.

Performed as expected

Ease of use.

Easy to use and makes it possible to force grease where it does not want to go.