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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 Couplers

    LockNLube Grease Gun Coupler

    Save time. Save grease. Save money.

    1770 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!


    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 1,770 Reviews
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    Filter Reviews:
    michael s.
    United States United States
    Exactly What I Needed

    I had a great experience with lock n lube grease gun coupler. I bought two different couplers from harbor freight that both broke within minutes of using them. Other couplers would get stuck on the zerk fittings, but not lock n lube. Lock n lube would go on to the zerk, stay in place, and then easily release when done. This product has really helped me with a 1970 Chevy C10 restoration project.

    Gerry B. Malek
    United States United States
    Greasing my RV

    I have a 1983 motor home and its been a bear trying to grease it, I've had to use one of the grease guns that you have to use a hammer with it. I just got done greasing the RV with your Coupler and it worked better than I had hoped for. Got all the jerks done with it and believe me some of them were mighty hard. I only wish I would have bought the swivel with it. Thanks again, Gerry PS I will be ordering the swivel soon as I get this email done.

    L P.
    United States United States
    Lock and lube Coupler

    I can finally grease my expensive equipment with the confidence that it’s getting grease. This product does exactly what it’s advertised to do. I highly recommend this product.

    Jacob B.
    United States United States
    Best Grease Coupler I have Used to Date

    I have spent a lot of money on several grease couplers in my search to find the best one. So far the LockNLube Coupler is the best one. 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. The one thing that sets this one far above the others is the ability to give it a second life with the repack kit. It lasts about the same amount of time that the other brands do but then you have the ability to repack it making it have over double the life time of any other coupler I have used to date.

    Nathan S.
    Canada Canada
    Prompt Service.

    Fabulous service! Very quick to receive the items I ordered.

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