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LockNLube® Grease Couplers

LockNLube Grease Gun Coupler

Save time. Save grease. Save money.

SKU: GC81011

As seen on

1775 reviews
  • Locks on, does not leak. Rated up to 10,000 PSI
  • 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
  • World's original locking grease coupler.
  • Includes a rebuild kit! The LockNLube® is the world's only rebuildable grease coupler. Lowest lifetime cost.
  • Easily releases from clogged grease fittings, even under pressure
  • Patented Locking Technology. US Patent #8955544
  • As seen on TruckU on the Motortrend Channel!


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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 is fully rebuildable. If it starts to leak, you simply replace the seal and jaws and it is as good as new. See our tutorial here. We include a free replacement seal and jaws with every coupler that we sell. Additional Seal Kits are also available from our store.


To see video reviews and read more customer comments, click here.



LockNLube provides a full 30-day money-back guarantee on all products purchased from its website. If you are dissatisfied with your purchase, you can return it to us by shipping the item back within 30 days of purchase. Once we receive your return, we will refund you the full purchase price of the item.

Please ensure that the item you are returning is repackaged securely, with all its component parts included. Please also include any documentation that came with your original order, such as a packing slip or order confirmation.


Return items to us by shipping to:

Lock and Lube
12 Commerce Ave. Suite #3
West Lebanon, NH 03784

For more information, please call 603.795.2298. We’re a small business and we’ll pick up the phone in New Hampshire when you call.


  • Works with all grease gun types: pneumatic, manual and electric.
  • Works on all Metric and SAE specification Zerks (grease nipples).
  • Fits 1/8-inch NPT thread.
  • Works with all grease gun manufacturers, including: Lumax, Alemite, Plews lubrication (Edelmann), Grainger, SKF, Macnaught, ADT, Milwaukee, John Deere, Wilmar, Legacy, Allstar, Sealey, Draper and many others.
  • Simply depress trigger to release, even under pressure.
  • No need to hold while greasing. Lock-on and free up both hands to operate your grease gun.
  • Durable nitrile rubber seal for longevity under high pressure.
  • Four hardened spring steel jaws are resilient under high pressure.
  • Check valve to reduce leakage.
  • Suitable for high-pressure, heavy duty applications.



Max pressure 10,000 psi (690 Bar)
Zerk Compatibility Fits all DIN and SAE specification Zerks (grease nipples).
Coupler Thread ⅛” NPT female thread.
Dimensions L: 3½ x W: 5/8 x H: 1⅗ In (L: 88mm x W: 16mm x H: 41 mm)
Diameter (front of coupler) 5/8 in (16 mm). Fits most recessed grease fittings (Zerks). ~1mm larger than standard coupler
Weight 4 oz. (100 grams)
Grease Gun Compatibility Works with all grease gun types: pneumatic, manual, and electric.
Seal Durable nitrile rubber seal for longevity under high pressure
Lock-on Mechanism Four hardened steel jaws are resilient under high pressure. Patent protected.
Patent US Patent #8,955,544
Customer Reviews
5.0 Based on 1,775 Reviews
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Brian J.
United States United States
Small horse farm

This is the best product I've purchased in years! I own a Kubota B21 tractor to help around the farm and greasing it has always been a frustrating experience, until I purchased your product! It does exactly what you claimed it would do! Thank you, Brian Jyringi

LOCKNLUBE LockNLube Grease Gun Coupler Review
Jared L.
United States United States
So worth it

We have been buying these for years and they are one all grease guns. we do our own maintenance and hire out or repair work, I even gave one to that mechanic. They save on the mess, but also, result in a lot less grease used. I believe they really speed up the greasing time. I have never changed the seals that they send extra in the package. We put them on DeWalt and Lincoln Grease Guns and works sweet. I just bought 10 just to stock up. I got tired of ordering a couple here and there

Paul N.
United States United States
Great Tool

Makes the grease go where it's supposed to. Makes for a better attitude when greasing my equipment. Wish I would have had it years sooner. Just ordered 3 of the 90 degree couplers for the tight spots. Highly recommend.

Darrel F.
United States United States

I love the LockNLube grease gun tips. I tried some other brand where you could lock it on like a hydraulic coupler, after about the 5th time of taking a wrench to loosen the hose so I could remove the coupling, I threw it away. I saw a YouTube farmer using the LocknLube tips, asked him where he got them, ordered 1, I now have 5! I still have 1 grease gun with the old style tip. I also ordered a LNL252 for my birthday present. I love it. I wish that I had seen Tony using that grease gun years ago.

United States United States
This is awesome

I grease tractor trailers and after I put this tip on my Milwaukee grease gun I couldn't have been happier. It grips the grease erk very strong so no grease squishes out of the side and makes a mess. Made greasing trucks a lot easier and cleaner. I would highly recommend this to anyone that uses a grease gun in their daily line of work.

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