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  • End Greasing Frustration

    The world's only rebuildable grease coupler
    Won't leak or pop off under pressure. Guaranteed.
    Works on all Zerk fittings, SAE and metric
    Ships free + 30-day money back guarantee!

    Won’t leak or pop off under

    Shop the Grease coupler
    "I am a dairy farmer and go thru hundreds of grease tubes each year. I had not found a good grease coupler until I used the LockNLube."

    — Jacob B.
    "The Lock N Lube grease couplers are the best thing since buttered bread! Quick, simple and easy attachment and removal...and it's rebuildable if it wears out."

    — Glen R.
    "OH my I've been missing what I didn't know I was missing, this coupler stays on and so far hasn't bled grease everywhere around the fitting."

    — Rick P.

    LockNLube Grease Gun Coupler

    Save time. Save grease. Save money.

    1788 reviews
    • Locks on, does not 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
    • World's original locking grease coupler.
    • 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!


    This item ships free!


    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 1,788 Reviews
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    Adam L.
    United States United States

    It worked great.

    I have a battery grease gun and had trouble removing it from the grease fitting. The locknlube grease coupler works great. It holds on the grease fitting and comes off with a squeeze of the handle. Anybody that has a battery grease gun needs to get the locknlube coupler.

    Robert H.
    United States United States

    Excellent Tool Accessory

    This is absolutely the best tool accessory I have every purchased. I have several old cars with gummed up grease fittings. This coupler unclogged several of them. Am going to buy a LockNLube grease gun soon!

    Danny R.
    United States United States

    A wonderful addition to my greasing operation

    After installing my LockNLube coupler on my battery operated grease gun, I tried it out on my loader. It worked perfect without any issues. It’s ease of operation was fantastic. I would recommend this product to anyone.

    David H.
    United States United States

    Lock and swivel

    These two items work exactly as described. I wish that I had of purchased them years ago!

    Matthew B.
    United States United States

    These are awesome

    These couplers work great. No more grease all over the place just lock it on and grease your fitting. They are very durable as well. Im still using ones I purchased years ago. Can’t say enough good things about the product. Also I have given them as gifts to help my friends grease with ease.

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