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.

Does not leak.

works perfect. Pretty neat how it actually works. Easy to get on and off the zerk.

I got tired of grease fittings slipping off so i bought this in hopes of solving the issue. It does lock onto the fitting but does not create a good seal. Once I started pumping, grease would start leaking out.

Works fantastic on a variety of sizes!

Great product helps with problem grease zerks that won’t move grease gets move without taking apart.

Works great. Wont fit into tight spaces

This works great! I initially bought a grease gun and thought I didnt want to double my expense by adding this coupler. After getting the coupler that comes with the gun stuck a couple of times and using words that will likely send me to spend eternity in the underworld, I ordered this coupler. This has been a great purchase as it is so much easier to use.

This is such a great idea. On Buddy Bearings it is the trick, no more broken fittings. Should pay for its in no time.

This coupler lock works great. I received it and put it on my hand pump grease gun and greased my skid steer and it did work great! Great product.

I had trouble with the previous fitting not getting grease into those hard to reach zerks. The lock n lube fixes that problem on the very first use.