LOLockNLube
LockNLube
LockNLube Grease Coupler
- Locks onto zerk fitting
- No grease blowback
- Patented design
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On this page
Is the LockNLube Grease Coupler worth it?
Yes, for the right buyer. The LockNLube Grease Coupler ranks #7 in our Best Grease Gun Coupler 2026 list (best no leak). Its biggest strength: patented locking mechanism eliminates grease blowback at the fitting. The main caveat: higher price than standard couplers.
Overview
What the LockNLube Grease Coupler does well
Best no-leak coupler. What earns it a place here: patented locking mechanism eliminates grease blowback at the fitting and grease only releases when trigger is pulled - no mess during attachment and removal. The tradeoff: higher price than standard couplers.
Specs that matter
Key features
- Locks onto zerk fitting
- No grease blowback
- Patented design
The trade-offs
Pros & cons
Pros
- Patented locking mechanism eliminates grease blowback at the fitting
- Grease only releases when trigger is pulled - no mess during attachment and removal
- Works on all standard SAE zerk fittings
Cons
- Higher price than standard couplers
- Locking mechanism adds bulk
Fit check
Should you buy the LockNLube Grease Coupler?
Think twice if this matters to you
- Higher price than standard couplers
- Locking mechanism adds bulk
Where it ranks
Featured in 1 best-of list
| List | Rank |
|---|---|
| Best Grease Gun Coupler 2026· Best No Leak | #7 / 10 |
Cross-shop
Alternatives to the LockNLube Grease Coupler
Products ranked near it in our research, each better for a slightly different buyer.
- Best ExtensionLincoln
Lincoln 5857 Hose Extension with Coupler
- Hose extension plus coupler
- Lincoln construction
Buying advice: grease guns
- Lever for power, pistol-grip for one-handed access, cordless for volume.
- Flexible hoses reach fittings behind wheels and under equipment.
- Locking couplers hold onto fittings and reduce leaks.
- 14 oz cartridges are standard. Check compatibility.
- A bleeder valve helps release trapped air when loading.
Read the full guides
Answers
LockNLube Grease Coupler: common questions
Is the LockNLube Grease Coupler worth buying?
Yes, for the right buyer. The LockNLube Grease Coupler ranks #7 in our Best Grease Gun Coupler 2026 list (best no leak). Its biggest strength: patented locking mechanism eliminates grease blowback at the fitting. The main caveat: higher price than standard couplers.
What are the downsides of the LockNLube Grease Coupler?
The main trade-offs owners and reviewers point to: higher price than standard couplers; locking mechanism adds bulk.
What are the key features of the LockNLube Grease Coupler?
Locks onto zerk fitting, No grease blowback and Patented design.
What are the best alternatives to the LockNLube Grease Coupler?
Worth comparing: Plews 30-107 Easy-On Lock Jaw Coupler, Milton S-1610 Four-Jaw Power Coupler and Lincoln 5857 Hose Extension with Coupler. Each ranks near it in our research for a slightly different buyer.
Where can I buy the LockNLube Grease Coupler?
It's sold on Amazon. Prices and stock change often, so check the current listing before you buy, our link takes you straight to it.
How do I know how much grease to inject into a fitting?
Over-greasing is as damaging as under-greasing, excess pressure blows the grease seal and expels the grease that was protecting the bearing. For most automotive and light-equipment zerks: inject until you see fresh grease appear at the seal lip. Count the number of pumps and record it for future reference, a wheel bearing might take 3 pumps, a U-joint 1 pump. For fittings with a grease nipple that vents: pump until the vent releases. Do not force grease against resistance, if a zerk feels blocked, switch to a needle coupler and check the fitting before continuing.
What type of grease should I use?
NLGI grade 2 multipurpose lithium grease handles most automotive chassis, wheel bearing, and general purpose applications. For high-temperature applications (brake components, oven conveyor bearings): use a high-temp red grease rated for the operating temperature. For marine or wet environments: a water-resistant marine grease. For food-processing equipment: NSF H1-rated food-grade grease. Do not mix grease types, different base oils and thickeners are chemically incompatible and can break down lubrication properties. If switching grease types: purge the old grease fully before switching.