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Plews
Plews 30-107 Easy-On Lock Jaw Coupler
- Lock jaw mechanism
- Stays attached to fitting
- One-hand operation
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On this page
Is the Plews 30-107 Easy-On Lock Jaw Coupler worth it?
Yes, for the right buyer. The Plews 30-107 Easy-On Lock Jaw Coupler ranks #4 in our Best Grease Gun Coupler 2026 list (best lock jaw). Its biggest strength: lock jaw locks onto zerk fitting - stays attached during greasing without holding. The main caveat: unlock mechanism requires practice.
Overview
What the Plews 30-107 Easy-On Lock Jaw Coupler does well
Best lock-jaw coupler. What earns it a place here: lock jaw locks onto zerk fitting - stays attached during greasing without holding and one-hand operation - free hand holds hose out of the way. The tradeoff: unlock mechanism requires practice.
Specs that matter
Key features
- Lock jaw mechanism
- Stays attached to fitting
- One-hand operation
The trade-offs
Pros & cons
Pros
- Lock jaw locks onto zerk fitting - stays attached during greasing without holding
- One-hand operation - free hand holds hose out of the way
- Useful on fittings that are difficult to reach with two hands
Cons
- Unlock mechanism requires practice
- Lower pressure rating than Lincoln
Fit check
Should you buy the Plews 30-107 Easy-On Lock Jaw Coupler?
Think twice if this matters to you
- Unlock mechanism requires practice
- Lower pressure rating than Lincoln
Where it ranks
Featured in 1 best-of list
| List | Rank |
|---|---|
| Best Grease Gun Coupler 2026· Best Lock Jaw | #4 / 10 |
Cross-shop
Alternatives to the Plews 30-107 Easy-On Lock Jaw Coupler
Products ranked near it in our research, each better for a slightly different buyer.
- Best Needle NoseLincoln Industrial
Lincoln Industrial 5807 Needle Nose Coupler
- Needle nose profile
- For tight access fittings
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
Plews 30-107 Easy-On Lock Jaw Coupler: common questions
Is the Plews 30-107 Easy-On Lock Jaw Coupler worth buying?
Yes, for the right buyer. The Plews 30-107 Easy-On Lock Jaw Coupler ranks #4 in our Best Grease Gun Coupler 2026 list (best lock jaw). Its biggest strength: lock jaw locks onto zerk fitting - stays attached during greasing without holding. The main caveat: unlock mechanism requires practice.
What are the downsides of the Plews 30-107 Easy-On Lock Jaw Coupler?
The main trade-offs owners and reviewers point to: unlock mechanism requires practice; lower pressure rating than Lincoln.
What are the key features of the Plews 30-107 Easy-On Lock Jaw Coupler?
Lock jaw mechanism, Stays attached to fitting and One-hand operation.
What are the best alternatives to the Plews 30-107 Easy-On Lock Jaw Coupler?
Worth comparing: Lincoln Industrial 5803 Hydraulic Coupler, Lincoln Industrial 5807 Needle Nose Coupler and Alemite 306931 Mini Coupler. Each ranks near it in our research for a slightly different buyer.
Where can I buy the Plews 30-107 Easy-On Lock Jaw 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.