Best Grease Gun Coupler of 2023 – A Comprehensive Review & Buying Guide

Lubricating can get messy and frustrating, especially if you work with lots of equipment at a time. If you get your hands on the best grease gun coupler your lubricating experience will get significantly better.

A perfectly suited grease gun coupler will save your time, keep your hands clean, and your work less messy. For all these important reasons, you must need a grease gun coupler suitable for your job.

Although choosing the right coupler is confusing as there are lots of couplers available on the market. We’ve reviewed and compared the best and top-rated grease gun couplers to help you find the perfect one.

If you are in a hurry to choose the right coupler, here are the top three picks for best grease gun couplers –

  • Lumax LX-1403 provides overall great performance considering the price and features. It will be perfect for all kinds of projects.
  • LockNLube regular grease gun coupler is a product with higher-end specifications and applications. This coupler is reliable, versatile, and well worth the money.
  • If you are looking for a budget option, then we would suggest you to go for ARES 71044 grease gun coupler. It will give you good performance with a cheaper option.

Comparison Of The Best Grease Gun Coupler

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Best Grease Gun Coupler Reviews

LockNLube Grease Gun Coupler


  • Pressure Rating: 10,000 PSI
  • NPT Connection: 1/8 inches
  • Item Weight: 0.2625 lbs.


LockNLube Grease Gun Coupler is the world’s best-selling and top-rated coupler that fits all grease guns. This coupler is completely rebuildable and provides a free spare seal kit with every package for easy replacement.

It is considered the best locking grease gun coupler. This product fits all SAE and Metric zerk fittings. It has a unique patent design so that the grease does not leak easily. It is resilient under high pressure with its four hardened spring steel jaws.

This coupler easily releases from clogged fittings so you don’t have to worry when the pressure is locked. It helps you to lubricate your vehicles or machines without messing with grease everywhere. You can easily push down to the coupler’s thumb lever to release it.

What We Like

  • Lock fittings with all kinds of grease gun
  • Completely rebuildable
  • Original locking grease coupler
  • Grease does not leak
  • It has a push-down release system
  • Steel jaws lock onto any zerk
  • It is easily replaceable by standard zerk fittings

What We Don’t Like

  • Sometimes it leaves grease around the nipple

LockNLube offers you another great grease coupler which is –

This product is bigger than the first LockNLube coupler which comes in a regular size. If you are looking for bigger reach then LockNLube XL provides you 4 inches of reach for recessed zerks.

Other than this, both products have the same feature all along.

Lumax LX-1404 Grease Coupler


  • Pressure Rating: 4,500 PSI
  • NPT Connection: 1/8 inches
  • Item Weight: 0.2 lbs.


Lumax LX-1404 Grease Coupler is a 90-degree coupler that provides you an excellent lubricating experience. This product is mostly used for hand-operated grease guns. It comes with a maximum pressure rate of 4,500 PSI. The recommended working pressure is 3000 PSI

This coupler is designed to reach hard-to-access grease fittings. It is zinc plated so the tool will get maximum protection against corrosion. It has a spring-loaded ball check valve that prevents leakage.

This is a very handy accessory for grease guns. It minimizes grease leaking possibilities with a leak-proof seal. It is ideal for the lubrication of front-wheel drive and all-wheel drive vehicles.

What We Like

  • Spring-loaded sleeve for angular precision
  • Effective at reaching complex grease fittings
  • It has versatile applications
  • Leakage proof coupler
  • It works nicely on every project

What We Don’t Like

  • Built quality is not up to the mark compared to other couplers

Lumax LX-1403 Grease Coupler


  • Pressure Rating: 15000 PSI
  • NPT Connection: 1/8 inches
  • Item Weight: 0.18 lbs.


If you work with high-pressure grease guns then this might be the best grease gun coupler for your work style. This versatile coupler has a pressure rating of 15000 PSI that can do heavy works swiftly.

This grease coupler is leakage proof and creates a minimal mess and grease wastage. It can save your time and money. The 1/8 inches NPT thread with hardened 4-jaws can withstand high pressure without deformation. If the pressure gets locked, you can disconnect this coupler easily.

This coupler can operate with a manual, battery, or air-powered grease gun. It is also can be used on bulk grease pumps. You can easily buy this quick release coupler for heavy works.

What We Like

  • The pressure rating is up to 15000 PSI
  • Compatible with all types of grease guns
  • It is accessible with coupling and uncoupling
  • Designed with leakage proof
  • It works well at any angle that is up to 90-degree

What We Don’t Like

  • It leaves grease at the fittings sometimes

Lincoln Lubrication 5883 Coupler


  • Pressure Rating: 1000 PSI
  • NPT Connection: 1/8 inches
  • Item Weight: 0.1 lbs.


Lincoln 5883 is a slotted right angle 90-degree grease gun coupler that suits every fitting. It lets you lubricate through fittings located in extremely tight spaces. This coupler can fit into fittings where the other couplers have failed.

Its 1/8 inches NPT female thread makes it usable for all types of grease gun hose. This coupler has a unique design, along its dimensions. This coupler doesn’t function as the extender but you can attach it directly to the grease hose.

It has a pressure rate of 1000 PSI, so it will not support all types of grease guns. However, this grease gun coupler will save your time and enhance work efficiency.

What We Like

  • Great material quality
  • Compatible for every fitting, even in tight spots
  • Pulling zerk is very easy
  • The unique design helps saving time
  • Minimizes work fatigue
  • Easy to clean

What We Don’t Like

  • Some grease might leak while using

ARES 71044 Grease Gun Coupler


  • Pressure Rating: Working Pressure: 4,500; Burst Pressure: 10,000
  • NPT Connection: 1/8 inches
  • Item weight: 0.81 lbs.


ARES 71044 grease gun coupler comes with a unique 4-jaw design that creates a secure fit every time. Its knurled bands will create a non-slip grip for easy use.

This coupler is tough enough for use in hand or air-powered grease guns. Its working pressure of 4500 PSI and burst pressure of 10000 PSI makes it perfect for heavy use. You can use this coupler with most grease guns and extensions because it comes with 1/8 inch NPT threads.

This product is safe for using mostly in a hand-operated grease gun. If you are looking for a grease gun coupler that can take higher pressure, then it is a good choice.

What We Like

  • 4-jaw design
  • It can take high pressure
  • Holds on zerks very tightly
  • Easy to install
  • Great build quality

What We Don’t Like

  • It could be leaking sometimes

The Complete Buying Guide For Best Grease Gun Coupler

Grease gun coupler is one of the most important things you need to consider before lubricating certain spots. Couplers come in different specifications and use. A perfect and best grease gun coupler will significantly increase your greasing efficiency.

We’re giving you a complete buying guide and it will help you to choose the best grease gun coupler for your projects –

Thread Size Of The Coupler

A coupler thread can be in many sizes depending on the manufacturer. However, a standard grease gun coupler should have 1/8 inches NPT thread. 1/8 inches NPT thread is compatible with most grease guns (manual, electric, pneumatic).

It is always safe to buy the coupler with standard thread size. The couplers we have reviewed all come with 1/8 inches NPT thread.

Grease Fittings

Before choosing the best grease gun coupler for your work, you need to consider the fittings you are going to lubricate. It is possible that the coupler you will buy might not fit with all zerk fittings.

You need to select the grease gun coupler that is compatible with all kinds of standard zerk fittings like SAE, Metric, etc. The coupler that is compatible with standard zerk fittings can handle multiple works in a row and will save your time and money.

Make sure that the coupler has a ball check in the head. It will prevent dust and contaminants, also helps to connect the fitting and the coupler.

Pressure Rating Of The Coupler

Knowing the pressure rating of your coupler is very important. You should know the recommended pressure and the maximum pressure the coupler can operate.

Suppose your coupler has its maximum pressure rating of 10,000 PSI. If you have a grease gun that can press the lubricant more than 10,000 PSI, there is a chance that the grease will leak. It will also damage the coupler.

Grease guns that can operate at 10,000 PSI are high-quality grease guns and can press more lubricant than other guns. You’ll need couplers with higher pressure ratings like LockNLube Grease Gun Coupler, Lumax LX-1403 Grease Coupler.

If your grease gun coupler can handle 10,000 PSI, it should be operated with an electric grease gun. If it can hold less than 10,000 PSI, then manual grease guns are the best option.

Rubber Seal/Jaws

From our experiences, the more rubber seals, the better. Most products come with 3 seals but some have 4 seal build such as ARES 71044 Grease Gun Coupler.

More rubber seal means the coupler has strong locking capabilities. If the strong lock-in is ensured then the grease will not leak while lubricating. More seal also means that the coupler can handle high pressure from the grease gun.

The Diameter Of The Barrel

Sometimes you have to work with tight fittings and face trouble greasing complex spots. In that case, you should use the smaller diameter of the coupler barrel because it will suit tighter spots.

A larger diameter coupler can’t fit in narrow spaces. Besides, you can do all kinds of work with a smaller diameter coupler.

Coupler Model

Grease gun coupler comes in different models according to various fittings. Couplers usually come in these models: Thumb lever; 90-degree slide-on; 90-degree push-on; 360-degree swivel.

If you work with tight and complex grease fittings then 90-degree couplers will be more suitable. You can use other coupler models for less complex fittings.

Your Current Grease Gun

You should note the pressure exerted by your current grease gun. Some bearings can’t handle pressure of more than 500 PSI. Now, if your grease gun has an output of 8000 PSI or more, the bearing leap could get damaged while heavy working.

Also, some bearings become troublesome reaching narrow spots. So, you should choose the coupler that can do these types of heavy works.

You need a coupler to attach the grease gun to certain fittings. So, you should choose the best grease gun coupler that suits you. We suggest that your desired coupler should contain the least grease leakages with the best locking capabilities.

Frequently Asked Question About Best Grease Gun Coupler

How do you adjust a grease gun coupler?

Firstly, you should have the perfect tip adjusts easily and makes your fittings tight. You can try narrowing the aperture of the grease coupler at the end of your grease gun hose so that it fits better.

You should keep your grease gun and coupler clean. It helps to unscrew the coupler easily in case it needs fixing.

Are all grease fittings the same size?

Not every grease fittings come in the same size. They can be in different sizes. Two fittings are mostly common: 1/4″-28 thread; 1/8″ NPT thread. There are other less common thread sizes are available on the market.

Most grease guns are compatible with 1/8 inches NPT thread. Our reviewed products are also compatible with this standard thread size.

Are there different types of grease fittings?

Grease fitting or zerk fittings are small hydraulic check valves used on bearing that helps to supply lubricant to certain parts. There are different types of grease fittings –

Type H Fittings:

This type means hydraulic fittings. Type H1, H2, and H3 represent the styles of H fittings. The H1 type is cheaper and preferable except where there is insufficient clearance to attach the hydraulic coupler.

Flush Fittings:

This kind of fitting is only available in straight-through varieties. Unlike hydraulic fittings, a cone-shaped grease-gun nozzle is used in this fitting. These fittings are typically fitted with drive slots for removal and installation.

Button Head Fittings

If your work needs a large volume of grease, in that case button head fittings are needed. They have larger ports that allow a faster fill rate. These fittings are more vigorous than hydraulic fittings and are used for heavy lubrication projects.

These three are the principal types of grease fittings. There are other grease fittings such as Bullet nose fitting; Rivet fittings, etc.

What should I do if my grease fitting won’t take grease?

If your grease fitting won’t take grease then the first thing you need to do is clean the fitting properly. After that, heat the fitting a bit and it should start taking grease again.

Sometimes fittings can’t be cleaned easily. In that case, you should use impact fitting cleaner. These tools will use compressed air to break through the clogged fittings.

Using a high-pressure grease gun will also help you to fix this problem. Operating pressure between 6000 PSI and 10000 PSI will do the work greatly.

You might face some situations when the fittings can’t be cleaned at all or have come to the end of its lifespan. In that case, you’ll have to replace the fitting.

Our Final Verdict

The primary interpretation of the grease gun coupler is to lubricate smoothly and effectively. The perfect coupler will always increase your work efficiency and make lubricating vehicles and equipment easier.

You should always ensure proper maintenance of your grease gun and its coupler so that you get the best performance. Our review and buying guide will definitely help you choose the best grease gun coupler. Let us know in the comment section for more inquiries.

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