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7 Best Grease Gun Couplers – (Reviews & Guide 2022)

If you want to keep your garage machines and equipment in good condition, the best grease gun coupler is a must-have. It makes zerk lubricating way easier as it removes the holding hassle. You probably already know how tricky it is to hold the lubricant and pump it at the same time with one hand.

Besides, it doesn’t matter if you are a DIY-er or a workshop professional, a grease gun coupler is super-convenient to work with (provided you know how to find the right one). Thus, we researched the market to find the top picks in this category. Let’s move on to grease gun coupler reviews, then to the buyer’s section, and the most frequent questions about this superb attachment.

See The Quick Comparison Chart

What is a Grease Gun Coupler?

A grease gun coupler is an attachment to the grease gun that makes greasing precise and simple. With this piece of equipment, you won’t have to hold grease when pumping it out of your grease gun, which reduces product waste but we will explain this in a bit.

Do You Need a Grease Gun Coupler?

Best Grease Gun CouplersIf you have a grease gun, you need a grease gun coupler as well. It offers numerous benefits we are going to list down below.

1. Better Lubrication

You wouldn’t believe the difference a grease gun coupler can make. This seemingly simple attachment can make you a lubrication expert in one-two-three. When you don’t have to use one hand to do multiple things at one time, you can truly nail this.

2. Effectively Injects Grease

All you should do is to attach it to the grease fitting and start pumping the grease. It takes very little effort to pump out a generous amount of the product.

3. Reduces Product Waste

When you can control the flow of the grease and the amount coming out of the gun, you are not wasting any product. This means you won’t use as much of it as you used to (and you can save up some money, too) and there will be no mess in your garage.

Best Grease Gun Couplers Comparison Chart

LockNLube Grease Gun Coupler - locks onto Zerk fittings

LockNLube Grease Gun Coupler – locks onto Zerk fittings

  • Price: $$$$
  • Customer Rating: 4.8
  • Weight: 4.2 ounces
  • Pressure Rating: 10000 PSI
View On Amazon
AZUNO Grease Gun Coupler Upgraded to 12,000 PSI

AZUNO Grease Gun Coupler Upgraded to 12,000 PSI

  • Price: $$$
  • Customer Rating: 4.2
  • Weight: 5.9 ounces
  • Pressure Rating: 12000 PSI
View On Amazon
Lumax LX-1403 Silver Heavy-Duty Grease Coupler

Lumax LX-1403 Silver Heavy-Duty Grease Coupler

  • Price: $$$
  • Customer Rating: 4.6
  • Weight: 2.81 ounces
  • Pressure Rating: 15000 PSI
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LockNLube Grease Gun Coupler XL

LockNLube Grease Gun Coupler XL

  • Price: $$$$
  • Customer Rating: 4.7
  • Weight: 4.9 ounces
  • Pressure Rating: 10000 PSI
View On Amazon
DEWALT Grease Gun Coupler Right Angle (DCGG5702)

DEWALT Grease Gun Coupler Right Angle (DCGG5702)

  • Price: $
  • Customer Rating: 4.5
  • Weight: 1.6 ounces
  • Pressure Rating: 10000 PSI
View On Amazon
Milwaukee 49-16-2649 M18 2-Pk Grease Gun Couplers

Milwaukee 49-16-2649 M18 2-Pk Grease Gun Couplers

  • Price: $$$
  • Customer Rating: 4.6
  • Weight: 2.08 ounces
  • Pressure Rating: 10000 PSI
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UTOOL Grease Gun Coupler

UTOOL Grease Gun Coupler

  • Price: $
  • Customer Rating: 3.9
  • Weight: 6.4 ounces
  • Pressure Rating: 10000 PSI
View On Amazon

Best Grease Gun Coupler Reviews

In this section, we will talk about some of the grease gun couplers that could be worth your attention. To make things easier for you we test tried them all and explained the pros and cons of each.

1. LockNLube Grease Gun Coupler – locks onto Zerk fittings

LockNLube Grease Gun Coupler - locks onto Zerk fittingsWe had no doubts about which product we should put first on our list. The LockNLube grease gun coupler is world-famous for its quality and performance. This product boasts amazing ratings and customer reviews as well and it is one of the most reliable couplers on the market.

It can handle pressure over 10,000 PSI, which means you can use it with powerful grease guns. Only the highest quality couplers are rated this high. We are going to talk more about pressure rating quality in a bit.

Another feature that speaks of the quality of the LockNLube coupler is that the jaw comes with 4 rubber seals. These 4 seals ensure the coupler can handle the pressure your grease gun is putting on it but also prevent grease from leaking.

This coupler comes with replacement jaws, which is very thoughtful of the seller. Jaws naturally wear out over time, especially when used frequently, and LockNLube saves your time and money by giving you a free spare part.

Although a bit pricier, the LockNLube grease gun coupler is just great – it makes a proper fit with most grease guns, efficiently lubricates zerks, and can handle heavy use.


  • 10,000 PSI pressure rating,
  • Leak-proof,
  • Pushdown release system.


  • It has a slightly wider barrel diameter so you might have to tighten it when working with narrower fittings.

2. AZUNO Grease Gun Coupler Upgraded to 12,000 PSI

AZUNO Grease Gun Coupler Upgraded to 12,000 PSIIf you thought things can’t get better when it comes to pressure rating quality, think again! The AZUNO grease gun coupler handles amazing 12,000 PSI, which already tells enough about its remarkable performance.

What is even more important, it is totally leak-proof as it comes with a durable sealing gasket and super-strong jaw. This makes the AZURO coupler suitable for workshops. You can heavily use it and none of its high-quality components will wear out. Doubtless, it makes a great pick if you usually spend a lot of your time in the garage.

You can operate it with one hand. Just lock it in the zerk and the grease will automatically start flowing out the mechanism. We appreciate the fact the grease won’t start coming out all until the seal is complete.

This strong and heavy grease gun coupler makes a match made in heaven with all guns and fittings, including SAE and DIN fittings. It comes at a slightly lower price than the LockNLube coupler, which may be important if you are looking for a budget-friendly, high-quality product.


  • A high-quality sealing basket prevents leaks,
  • Can be operated automatically,
  • Can handle heavy work.


  • A bit tricky to fit into tight places,
  • Some customers find it bulky.

3. Lumax LX-1403 Silver Heavy-Duty Grease Coupler

Lumax LX-1403 Silver Heavy-Duty Grease CouplerThe Lumax LX-1403 is the universal type of grease gun coupler so you can use it to lubricate all zerks. It is quite similar to the LockNLube coupler but features an even greater pressure rating of 15,000 PSI. Now, that’s what we call a high-quality coupler.

You can use it with manual, battery-powered, and pneumatic grease guns and lubricate those fittings with the utmost ease. This coupler comes with standard jaws, which confirms it would be a good fit with most zerks on your tools and/or vehicles.

We appreciate Lumax because they equipped this model with the ergonomic lever that makes it super-easy to handle. Coupling and decoupling are super-convenient as well, even under high pressure. The LX-1403 provides great value for the money and makes lubrication a breeze for both DIY-ers and professionals.


  • Suitable with all types of grease guns,
  • Ergonomic design,
  • Leak-proof seal.


  • The lever is half an inch shorter than with other grease gun couplers on the market,
  • The end coupler diameter is 5/8 inches, which may be an issue when you are working with tight-spaced zerks.

4. LockNLube Grease Gun Coupler XL

LockNLube Grease Gun Coupler XLThis grease gun coupler is one more proof LockNLube makes the best couplers. The XL model, as you can already guess, comes with a longer barrel. The barrel is 3.6 inches long while their regular model comes with a 1.6-inch barrel.

If you are working with recessed grease fittings, make sure to have this XL coupler in mind. It can make access to tight spaces way easier, especially when it comes to harvester heads and U joints. Once you get there, simply pump the grease and you are good to go.

The LockNLube XL coupler features a 1/8-inch thread so you can use it with a wide range of grease guns. Also, it fits most grease fittings and produces no leaks. The reason for this is in the 4 rubber jaws that ensure a tight seal through which the grease can’t pass. As a cherry to the top, it can handle 10,000 PSI of pressure, which is fairly impressive.


  • Hands-free use,
  • Does great with tight spaces,
  • Comes with replacement jaws.


  • On the expensive side.

5. DEWALT Grease Gun Coupler Right Angle (DCGG5702)

DEWALT Grease Gun Coupler Right Angle (DCGG5702)If you like all the features the LockNLube XL offers but would prefer a coupler that comes at a lower price, this right angle coupler by DEWALT might be it. It also has a pressure rating of 10,000 PSI and fits tight spaces with ease.

Designed for different types of applications, this heavy-duty model is just perfect for professionals running workshops. It makes a great choice for idler pulley bearings. No matter how much pressure you put on the zerks with your grease gun, this coupler won’t leak or cause any mess.

This 1/8-inch NPT thread coupler allows you to lubricate fittings on your tools at the right angle and boasts superior quality you can rely on for many years to come. Just in case it doesn’t fit your zerks as you expect, DEWALT gives you a 30-day money-back guarantee.


  • Durable and long-lasting,
  • The small diameter makes it convenient for lubricating hard-to-reach zerks,
  • Ideal for cordless grease guns.


  • The tip is not adjustable.

6. Milwaukee 49-16-2649 M18 2-Pk Grease Gun Couplers

Milwaukee 49-16-2649 M18 2-Pk Grease Gun CouplersThe Milwaukee M18 is one of the best couplers for professional and long day use so you might want to keep your eyes on this one if you have a workshop. Durable, not overly expensive, and quite powerful, the M18 ticks all the boxes for most users.

It is rated at 10,000 PSI so you can use it with basically any type of grease gun. As it boasts high-quality jaws, you will never experience a grease leak with this one. Just fit it properly and the grease will start coming out and lubricating those zerks.

The head of this coupler provides a very tight fit without requiring you to apply any extra effort. Also, removing it is a no-hassle as well. Probably the best thing of all is that you get 2 great couplers at the price of one.


  • Made of high-quality steel,
  • It can take high pressure,
  • Amazing price for the pack of 2 couplers.


  • Although we couldn’t find major objections to this coupler, it still underperforms when we compare it to some high-end couplers on the list.

7. UTOOL Grease Gun Coupler

UTOOL Grease Gun CouplerIf you don’t need a coupler for heavy but occasional use, UTOOL might have something in store for you. This coupler features a quite large diameter so keep this in mind if you typically work in tight spaces. It is a bit bulky and heavy so you should invest some effort into handling it.

We thought this coupler is rated at 10,000 PSI at first. However, we discovered it can actually handle 12,000 PSI, which means you can use it with both manual and electric grease guns. The UTOOL coupler comes with a classic, 1/8-inch thread so you can rest assured it will fit most grease fittings as well.

This coupler makes grease injection a breeze, it is fairly durable and affordable, fits most guns and zerks, and that is basically what any DIY-er can look for in a grease gun coupler.


  • Thickened jaws prevent leakages,
  • Fast locking and unlocking mechanism,
  • Hands-free greasing.


  • Not meant for heavy use.

Grease Gun Coupler Buying Guide

Grease Gun Coupler Buying GuideNo matter how good your grease gun is, you can’t do much without a good grease gun coupler. Oh, by the way, check our guide on the best pneumatic grease guns if you need a good product in this category.

Going back to grease gun couplers, how do you choose the right one? Could you spot the best one just by reading our reviews? Although there is a slight chance you could, we still wanted to help those who have never used grease gun couplers before by giving them hints on the most important features to look for in this tool.

1. Thread Size

Most couplers fit with 1/8-inch NPT (National Pipe Taper) threads that connect them to the grease hoses of various guns. Thus, you should make sure whether the coupler you have laid your eyes on can supply the thread.

If you have an air-operated, manual, or electric grease gun, you can go for a 1/8-inch taper thread. Of course, you can find threads of other sizes. Not all greasing tools or guns are compatible with 1/8-inch couplers.

We still recommend the standard coupler size as it typically fits all greasing tools. Check your greasing gun manual for more info.

2. Coupler Type

There are several grease gun coupler types. You can choose between 90-degree slide-on, push-on, and 360-degree swivel models. When working with hard surfaces, you should go for one of the 90-degree models.

3. Pressure Rating Quality

How do you know whether your grease gun can handle the pressure coming from the coupler? The highest quality grease guns can handle 8,000 to 10,000 PSI. You can even find couplers that can deliver a pressure higher than 10,000 PSI in case you expect even more lubrication.

However, we want to warn you that releasing more lubricant can result in multiple leaks. In the worst case, you may damage or break the coupler. Typically, couplers that deliver more than 10,000 of pressure work best with electric grease guns. Couplers rated below 10,000 PSI fit manual guns best.

4. Grease Type

What type of grease do you typically use when lubricating fittings? Take this into account when buying a grease gun coupler. If you change the type of grease often, especially if you have a workshop, look for a coupler that will be a good fit with any type of grease.

5. Barrel Diameter

Barrel DiameterWorking with tighter zerks means needing a slimline barrel coupler. Buying a larger diameter coupler can cause you headaches as you may be lacking precision and wasting grease. If you are looking for a grease gun coupler for commercial purposes, a smaller barrel diameter would be a better choice.

6. Seals

Here’s another way to reduce grease leakage. Each coupler jaw (provides a proper fit to your grease gun) features a rubber seal. Go for a coupler that comes with 3 to 4 seals. If it provides a strong lock, then no grease will go to waste. The best quality couplers come with 4 seals, which means they can take on high pressure with ease, without leaking.

7. Maintenance

If you want your grease gun coupler to last you for a while, you should take proper care of it. Clean your coupler after each use if you want to prevent grease from collecting and making stops and blocks. A jammed coupler will underperform so you might have to get another one in a short period.

FAQ About Grease Gun Couplers

1. How Does a Grease Gun Coupler Work?

Firstly, you should attach a grease gun coupler to your grease gun. Then, the pressure you put on it with your grease gun makes the grease come out of the coupler. Coupler directs the grease and lubricates zerks.

2. How do you adjust a grease gun coupler?

You can twist a grease gun coupler to control the release of grease. All you should do is use your pliers and tighten the coupler.

3. How do you replace Zerk grease?

Loose zerks with a wrench so you can remove them. Use a piece of cloth or an old towel to clean the zerk housing and remove old grease. Take the zerk back and tighten it with a wrench. Place your gun over the zerk fitting and make sure it sits properly on top of it. Pump out the grease.

4. Are grease fittings metric?

Yes, grease fittings are available in 2 sizes, the 1/8-inch thread we already mentioned above and 1/4-inch 28 thread.

5. How do you connect/disconnect a grease gun to/from a zerk?

You simply place a gun on top of the zerk and release some pressure to create a strong seal (a coupler will help here, too). When you want to detach it from a zerk, simply release the pressure and take it off the zerk.

Wrap Up

Greasing your tools and machines can significantly extend their lifespan. What is more, it can save your life. If you own a car, truck, or any other vehicle, make sure all zerks are properly and regularly greased, otherwise you can end up in a dangerous situation. When you find the best grease gun coupler, you will make sure everything is greased and maintained adequately.

We spoke about the most important features to look for in a grease gun coupler and presented several models in our grease gun coupler reviews so you can find the type that you need. Don’t forget to check our other guides on useful tools. See you there!

About Jason Parker

Jason Parker learned that being a cyclist doesn’t only mean riding – he decided to build his own workshop for maintenance and fixing. Soon enough, he realized that there is no decent workshop without air tools (of various types). Through research, trial, and error, he decided to gather all his knowledge (so far) into these blogs and guides.

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