Best Grease Gun Coupler [ Top 10 Picks & Reviews ]

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Lubricating in a truck or any garage equipment is difficult for their holding hassle. If you have a car, truck, or any equipment farm you know lubricating is essential for this type of equipment. Grease gun coupler makes this lubricating process easy. You don't need to hold grease by another hand when you are pumping.

Jaws is an important part of grease gun coupler that will help to fittings grease and lock them. When you need to lubricating narrow space or multiple target at once grease gun coupler is invincible. These tools will make easy your complete lubricating process without loss grease.

However, Lots of grease gun coupler in the market I loved LockNLube and it has some awesome features. I review and research a few couplers and make a list of the best grease gun coupler below.

Our Top 10 Picks - Comparison




More Details

Weight: 4.2 ounces

Dimension: 3.45 x 0.63 x 1.66 inches

Warranty: Lifetime manufacturing warranty


Weight: 2.9 ounces

Dimension: 4.8 x 1 x 4.8 inches

PSI: 15,000


Weight: 6.4 ounces

Dimension: 3.19 x 1.57 x 0.79 inches
PSI: 12,000


Weight: 3.2 ounces

Dimension: 5.9 x 3.5 x 0.9 inches

PSI: 4,500

Weight: 0.32 ounces

Dimension: 4.5 x 1.25 x 2.75 inches

PSI: 1,000

Weight: 2.4 ounces

Dimension: 1.95 x 3.92 x 0.98 inches

Weight: 2.4 ounces

Dimension: 5.3 x 2.1 x 0.6 inches

PSI: 4,500

Weight: 4.5 ounces

Dimension: 3.5 x 2.8 x 0.8 inches

PSI: 4,500

Weight: 1.6 ounces

Dimension: 6.88 x 3.25 x 1.13 inches

PSI: 10,000

Warranty: 30 day warranty against manufacturer defects

Weight: 4.8 ounces

Dimension: 4.75 x 1 x 7.5 inches

PSI: 15,000

LockNLube Grease Gun Coupler is compatible with battery, pneumatic, manual all grease guns. It is considered to be the only reconstructed grease coupler in the world. This grease is not driven by any machine. This coupler contains a high-quality locking system that made it unique.

Therefore, this made with high-quality material so the coupler does not leak easily. This grease coupler is available at very low prices. Suitable for long-term use so its demand is increasing day by day in the market.


  • Locks on and No leaks grease gun.
  • Jaws are four hardened spring still so it can take high pressure.
  • This coupler lock fitting all type of grease gun.
  • If coupler locked by the pressure it can release easily even it can take extreme pressure.
  • Easily replaceable by any type of SAE and Metric Zerk Fittings.


  • Original locking grease coupler
  • Leak-free coupler
  • Completely rebuildable grease coupler
  • Pushdown release system
  • It can work fine with invisible Zerk


  • Sometimes leaving grease around the nipple

Most are battery-powered or air-powered grease guns, so it's easy to handle. Coupling and uncoupling is the very hard task for coupler but this coupler ergonomic thumb lever design will make it very easy for you. The coupler can connect 1/8 "NPT so it can do all kinds of heavy work.

This heavy equipment grease gun coupler has 15,000 psi with an integrated non-return valve which applies extra pressure. Also able to disconnect easily due to extra pressure. You can use it at a high temperature without hassle. Certainly, you can buy it because it is a good quality coupler.


  • The easily quick connected and quick release mechanism.
  • Leak-proof seal with coupler locks on.
  • Innovative design that firmly bolts on grease fittings.
  • Ergonomic thumb lever design makes this coupler another level.
  • Disconnect effortlessly when taking it extra pressure.


  • It can disconnect at high pressure up to 15000 PSI
  • Suitable with all type battery and air-powered grease gun
  • Effortless coupling and uncoupling
  • 1/8 inches NPT connection integrated
  • Thumb lever design for quick lever


  • Sometimes leaked grease in fittings

AZUNO Grease Gun coupler has locks and seals up to 12,000 psi. Rather the coupler also has a strong jaw, long-lasting sealing gasket. Ensures stable performance and can prevent leakage even at pressures up to 12,000 psi. The coupler is made of very high-quality material so you can use it to work in a shop or garage all day long. It is heavier and stronger than other grease couplers on the market.

You should operate this coupler by one hand for longer use. If the grease coupler is locked in the zerk fitting once it runs automatically and the grease gun frees both hands from handling. The unique design of the coupler helps to detect zerk fittings in the dark. Its patented retract mechanism leaves the inner seal behind and leaves the outer socket ring wide open.

This coupler is durable so it is compatible with all grease guns and zerk fittings. A grease gun with 1/8 NPT. The coupler fits all DIN and SAE grease fittings. This coupler is durable so it is perfect for long time use.


  • Capable of applying pressure up to a maximum of 12,000 psi.
  • It contains high-quality sealing gasket.
  • Suitable for all-day use in shops or garages.
  • It can be operated automatically without the help of hands.


  • Strong jaw made it different
  • Attractive eye-catching design
  • Able to do heavy work
  • Zerk fittings are very strong
  • Perfect coupler for longer use


  • Hose just wouldn't work

The coupler works perfectly without any leaks. Spring-loaded balls check the valve to prevent leakage. This coupler is mostly used in hand-operated guns. It also has a spring-loaded sleeve that connects quickly. The coupler is capable of taking pressures up to a maximum of 4,500 psi. The head of this coupler is slightly shorter than the standard straight coupler.

Subsequently, this allows the coupler connection to be easily and gently expressed. The unit is firmly spread over the zerk fitting and moves very easily after finishing the work of greasing, just like the other standard couplers.

There are no leaks anywhere in the grease and the hose connector contains to the zerk fitting unit when pumping the grease. All the pump conditions are good if you can use it in one hand. This coupler serves as a helpful accessory for any grease gun.


  • For use on hand-operated grease guns only.
  • Capable of taking pressures from 3,000 psi to 4,500 psi.
  • Very effective for lubricating various parts of vehicles.
  • Sleeves contains to the coupler for medium and heavy work.


  • Able to take maximum pressure of 4, 500 psi
  • Works perfectly for all projects
  • Leakage proof
  • High-quality coupler
  • You can use it for a long time


  • It may trouble sometimes but recovered it quickly

It works very perfectly so it is usable for every fitting. Slide the dagger fitting of the zerk while using. Its fitness can work a little harder than other shots. You should have worn a flexible hose while pumping. There is no need to apply excessive force to work with this coupler.

However, this coupler does not leak in any grease and pulls the zerk very easily. This coupler works very well. If you don't want to permanently attach this coupler to your small grease gun, you can go to the auto parts store and buy a grease zerk and use it as an attachment.


  • This coupler with 90 degrees slotted design allows the application of grease to remove strong spots.
  • The 90-degree grease jerk used in it eliminates the need to switch fittings.
  • Some hoses and tubes fit everything.
  • Able to handle pressures up to 1,000 PSI.


  • Usable for each fitting
  • It can take high pressure
  • This material quality is very high
  • Zerk pulling is very easy
  • Unique attractive design


  • It could be leaking

The coupler greases very well and it is suitable for long day use. These couplers prevent grease leaks and work properly. This coupler is very durable and not too expensive. The coupler works exactly where it is fitted. It is easy to use.

The genuine head of the coupler is very great and ensures proper lubrication. You can remove this coupler without any hassle. There is no need to apply excessive force to work with this coupler. This coupler does not leak in any grease and pulls the zerk very easily.


  • Suitable accessory for an M18 grease gun.
  • Made of high-quality steel.
  • Ideal for use in small and hard spaces.
  • Very effective for lubricating various parts of vehicles.


  • It can take high pressure
  • Cheap but works perfectly
  • You can use this coupler longer than others
  • Made of high-quality material
  • This coupler can lubricate properly


  • Doing heavy work can be a problem

The coupler is used to grease boat trailer bearings. It is suitable for use in all types of fittings. The coupler can work perfectly. It can be easily removed by simply twisting without any hassle. It is suitable for use in compact marine style grease guns, boat trailers, and r/v.

This grease coupler works great. No screwdriver is required to set the coupler. The coupler has four hard steel jaws for long durability. There are also spring-loaded check valves to prevent leakage. Knurled body and flats have been created for easy installation and removal.


  • There are spring-loaded ball check valves to prevent leakage.
  • The small diameter allows easy contact with the recessed fitting.
  • 1/8 inch NPT thread attached.
  • USA Made so heavy duty.


  • It has four strong steel jaws for long durability
  • There are spring-loaded ball check valves
  • Very easy to install
  • Made of high-quality material
  • Perfect for long time use


  • The removal process is not easy

Lumax Silver LX-1406 Coupler is used for most hand operated grease guns. It swivels in full 360-degree circles. Most fittings are easily accessible with a 45-degree angle. The coupler is capable of taking pressures up to a maximum of 4,500 psi.

The swivel fitting of this coupler is versatile so it will easily cure your problem. If you have difficulty reaching grease fittings, you may need this coupler. It is also strong, durable, and long-lasting. This coupler is cheap so you can buy it easily.


  • For the use of hand-operated grease guns.
  • Able to swivel in full 360-degree circles.
  • 1/8 inch NPT thread attached.
  • 4, applies maximum pressure up to 500 psi.


  • Excellent for reaching hard to access fit bearings
  • Fitting is excellent
  • Pressure taking capability is very high
  • Longer lasting coupler
  • Versatile swivel fitting


  • You may be confused when swivel fitting

The coupler is designed in such a way that it can be tightly accessed up to zero fitting. This coupler can withstand pressures up to a maximum of 10,000 psi. Able to work for all kinds of heavy applications. A right-angle adapter can be used when greasing spindle bearings on the Ferris IS500Z with a 52 "deck.

The coupler has three spindles and a grease fitting for idler pulley bearings. The coupler moves out of the zerk without any difficulty. Surprisingly this coupler works great. It is durable and long-lasting.


  • Zerk fittings are very effective for cordless grease guns.
  • Strongly designed to reach zero fittings.
  • All types of heavy-duty can be done for applications.
  • The small diameter allows easy contact with the recessed fitting.
  • 1/8 inch NPT thread attached.


  • It can apply pressure up to a maximum of 10,000 psi
  • Able to do heavy work
  • Has strong fittings
  • Works great
  • High-quality products


  • It doesn't work properly for all applications

The extended coupler helps you to reach the grease fittings also allows tight access to fit this coupler. Most are battery-powered or air-powered grease guns, so it's easy to handle. The coupler is able to connect 1/8 "NPT so it can do all kinds of heavy work.

The coupler has 15,000 psi with an integrated non-return valve which applies extra pressure. Usually, it can disconnect easily due to extra pressure. This coupler can tolerate high temperatures. Particularly, you can buy this coupler because it is very good quality.


  • Able to take burst pressure up to 22,000 psi.
  • Made of high-quality steel.
  • The coupler has a height of 2.9 "length x 1.2".
  • Ideal for use in small and hard spaces.
  • It contains high-performance hydraulic seals.


  • Attractive design
  • Contains 1/8 "NPT Integrated Connection
  • This coupler can take the pressure up to 15,000 psi
  • Very easy to use
  • It is a Durable coupler with the most grease gun


  • Sometimes it difficult to install

Things to Consider Before Buying Grease Gun Coupler

Thread Size

Since the coupler is supplied with 1/8 ″ NPT thread to connect to the hose of the best grease gun, care must be taken to ensure that the coupler is able to supply the thread. There are some important things that are compatible with most grease guns, such as pneumatic, manual, and electric. Almost all grease guns are made with this thread.

Pressure Rating Quality

Make sure the grease gun can handle the maximum pressure. If grease guns can handle pressure from 8.000 psi to 10.000 psi, then they are considered to be high-quality grease guns. If you want to buy a gun with a pressure of more than 10.000 psi, which can press more lubricant than others.

Keep in mind that too much lubricant is released when the guns are pressed, they leak very quickly, damage the coupler and even break it. If your coupler is able to handle the pressure of 10.000 psi, then you should have powered by an electric grease gun. If the coupler can handle pressures below 10,000 psi, it must be operated with a manual gun.

Rubber Seals

Most users think that the more seals a grease gun has, the better. Guns usually have 3 seals, while some grease guns have 4 seals. If there are 4 seals, then it should be considered that it has the ability for the strong lock. If there is a strong lock, there is no possibility of leaking during the injection.

Also, this gun is capable of holding high pressure. Seals should be thoroughly inspected before buying the best American made grease gun.

The diameter of the Barrel Ideas

Many times tight-spaced zerks need greasing. Grease the narrow space and if you are a beginner to do the job, choose the smaller diameter for the connecting barrel. It can be easily greased in a narrow space by a small-diameter connection. This type of work is usually not possible with a large diameter connection.

All kinds of work you can do with small diameter grease guns. Before buying a grease gun you need to have an idea about the diameter of the barrel.

Coupler Model

Grease gun couplers come in different models. The most common couplers typically have a thumb lever, a 90-degree push-on model, a 90-degree slide-on, and a 360-degree swivel. 90-degree models of couplers are suitable for all types of hard surfaces. There are different models of couplers available in the market, from these you have to choose the coupler you need.

Easy to use Grease Gun

It is important to note that the gun you can press evenly. There are some bearings that cannot increase the pressure by more than 500 psi. If you use a gun with 7500 psi for heavy work, its bearing leap will be damaged very quickly. Some bearings become complicated to place in narrow spaces. You need to choose a coupler for the gun, which can easily do the hard work.

Recommended reading:  How to Use a Grease Gun

Final Thoughts

After skimming above all if you think lubricating is a very hard process. Especially greasing in the variant target at the same time or narrow space you can use grease gun coupler without a doubt. Unprivileged maintenance of greasing guns can make stuck coupler so ensure its proper maintenance.

Perfectly injecting grease can easier your tools and equipment with your life. I recommended some grease gun above and I suggest you LockNLube grease coupler for the first purchase. I hope my list of best grease gun coupler will help you to find perfect grease gun coupler.


What is a grease gun coupler?

Ans: Grease gun coupler is holding equipment that used for the easy lubricating process. If you have a car, truck, or any equipment farm you know lubricating is essential for this type of equipment. You don't need to hold grease by another hand when you are pumping.

How do you attach a grease gun to a Zerk fitting?

Ans: Firstly, set the grease gun then screw the 4 jaw construction. Now you can see some small nipple that contains a ball bearing with hole and threads. You can fit zerk now inside coupler and it is completely ready.

Are there different sizes of grease Zerks?

Ans: Standard grease zerk is a single size. You can see another weird out from there but it is just button head.

How do you fill a grease flush-fitting?

Ans: Just clip it at the end of your grease hose when you insert this into the grease fittings the end of this adapter will unseat a check ball in here allow you to put grease in the unit when you remove it then that chuck ball seals the fitting up.

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