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.

Works great... Way better than the original grease coupler... i should have bought one sooner. would have saved me some headache.... i definitely recommend you buy one.... it locks on well. and easy to use.. no leaks. and fits well

Works great, little big for tight spaces, good quality

Using on a Milwaukee M18 grease gun. Works as claimed. Larger diameter tip makes some zerks more difficult to grease due to limited space. However, one handed operation is very nice and worth it.

Works like a charm!

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.

Excellent product. I have a few grease fittings on my boat that are very difficult to see and even harder to reach. A regular grease coupling kept coming off making lubrication impossible. With the LockNLube Grease Coupling I can reach into the small space and lock it on. It stays connected with no grease leaking out. I will not need another grease coupling ever again. Quality product worth the price.

I have a Slippery Pete mini grease gun, which is fantastic, but the screw connect head is a pain for anything remotely hidden or hard to reach. I purchased the LockNLube coupler and it is fantastic! So easy to use and seals perfectly. This is a must for ease of use. Quality made product, easy to install on your grease gun or hose, and works as it should.

This thing really works! I highly recommend!