32,909 Reviews



End greasing frustration with the original locking grease coupler!

  • Locks on, stays on, won't leak. Rated up to 10,000 PSI

  • Easily disconnects, even under pressure. No more broken Zerks

  • 1/8" NPT compatible with all grease guns - battery, pneumatic, manual

  • Grease goes in, not on, the machine

  • Works on all Zerk fittings, SAE and metric

  • Includes a rebuild kit! The LockNLube® is the world's only rebuildable grease coupler. Lowest lifetime cost.

  • Patented Locking Technology. US Patent #8955544

  • As seen on TruckU on the Motortrend Channel!

End greasing frustration with the original locking grease coupler!

The LockNLube® Grease Coupler is compatible with all grease guns and grease fittings. It does not leak once locked on and will not pop off under pressure. No hands are needed to align or hold the coupler in place while greasing. You have both hands free to operate your grease gun and know that the grease will go in, not on, your machine. Guaranteed.

It has a unique sliding sleeve, activated by a thumb lever. The sleeve locks the four spring-steel jaws onto the Zerk fitting, and releases the jaws by pushing on the thumb lever. When the jaws are locked onto the Zerk, a leak-proof seal is created. The locked connection is positive and rigid preventing the coupler from coming loose and breaking the leak-proof seal. If a fitting becomes pressurized, especially a recessed one, just depress the thumb lever and release the coupler.

The LockNLube® Grease Coupler doesn't pop off, doesn't leak, and easily releases with a thumb lever, even at extreme pressures.

LockNLube has changed the way you connect to Zerk fittings with a patented sliding sleeve to lock the four hardened steel jaws onto the Zerk, creating a leak-free seal.

No hands are needed to hold or align the coupler. You have both hands free to use your grease gun

and know that grease is going in, not on, the machine.

Stuck on couplers are a thing of the past. Just push down the thumb lever on your LockNLube® Grease Coupler, and it comes right off, even on recessed Zerk fittings.

  • Max Pressure: 10,000 psi (690 Bar)

  • Zerk Compatibility: Fits all DIN and SAE specification Zerk fittings

  • Coupler Thread: 1/8” NPT female thread

  • Dimensions: See charts below

  • Diameter (front coupler) 5/8" (16 mm)

  • Weight: Regular: 4 oz (100 g). XL: 6 oz (165 g)

  • Grease Gun Compatibility: Works with all grease gun types – pneumatic, manual and battery

  • Seal: Durable nitrile rubber seal for longevity under high pressure

  • Lock-on Mechanism: Four hardened spring steel jaws are resilient under high pressure

  • Patented Locking Technology US Patent #8955544

"Greatest thing since the invention of the aluminum beer can ... won't own a grease gun without it"

— Chris C.

  • "So much better. Always had problems with the traditional grease gun end fittings. Tried the LockNLube on various sized grease nipples and it works perfectly. Great product and the fact it includes spare parts is a bonus."

    Mark B.

  • “Greatest thing since the invention of the aluminum beer can... won’t own a grease gun without it”

    Chris C.

  • "I have not wasted a drop of grease!!! I have greased everything that I have and love this product!!!!!"

    Tim R.

  • "I bought a competitor’s coupler trying to save a buck or two. Could not reach many of my recessed grease fittings because of the size of the coupler's head. Ended up coming back to LockNLube to solve the problem. Locks on tight, releases easily, and I can now get to “all” of the grease fittings. Get one."

    Vince B.

Two Sizes Available

The LockNLube® Grease Coupler comes in two sizes, Regular and XL. Both have a barrel that is just 1mm wider than standard four-jaw couplers. The XL version is two inches longer, giving you extra reach for deeply recessed fittings.







LockNLube® Grease Coupler

Traditional Coupler

The Best Tools - The Best Customer Service - The Best Built Guarantee

If our products don’t work better and last longer than anything out there, we’ll make it right. If you aren’t satisfied with anything you buy from LockNLube, send it back within a year for a full refund - no strings attached. We’ll still consider returns after a year, you’ll just need to call us and tell us what happened. But if your kid runs over it with a tractor, you’ll probably need to buy a new one.

Call or email for assistance: (603) 795-2298 | sales@locknlube.com