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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.

    1777 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 1,777 Reviews
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    Don C.
    United States United States
    Greasing and coffee time at same time…

    Great product I can drink coffee and grease . I use one hand now to do my greasing coffee cup in the other hand. Thanks. LOCKNLUBE….

    Jeffrey C.
    United States United States
    Great for getting grip

    bought it specifically for the U joints on my ram 3500 in the Front axle by the steering knuckles. Could never get another grease gun head in there. Going to recommend this product to the rock quarry that I work at also!

    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.

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