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.

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.

Awesome product, safest in the industry! Works as described! Must buy!

I balked at the price at first. It's half the price of grease gun, but it works. I have arthritis in my hands and trying to pump grease with one hand and holding the barrel on the zerk fitting didn't work. Screw on/off, bayonet types, tried them all, but this one performs as advertised. Squeeze the lever and push it on the grease fitting and it holds tight without any help from me. I can use both hands to pump grease. And it is fast. I did a whole bucket loader with backhoe in 15 minutes.It is small enough to fit into tight places on itty bitty Japanese tractors.I'm so happy, I'm going to grease the drive train on my Jeep right now just because I can.

My husband is raving about this adapter. We tried to grease the zeros on our rv but found many of them would not take the grease. He struggled to push the grease gun fitting onto the zeros which were over his head. We were in the process of buying new zerks when we came across this fitting. The zerks that would not take grease took it with this fitting clipped on. It is expensive tool but man it works awesome.

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.

Made it easy to keep the Bearing Buddies on my boat trailer packed with grease. Easy to use, no leaks! Well-made quality product, fits perfectly.

Used it today and I was kicking myself for not buying this awesome, locking tool sooner! Stays on the grease fitting until your done. You're able to use both hands to pump your grease gun & focus on the bearing for the new grease squirting out. So much easier!

WOW! This Lock Nut tool really works! I used it on my Haulmark trailer hubs because my old grease tip wouldn't fit on the zerk fitting. The tool locked on the fitting tightly and made my job a lot easier. Very happy with it.