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The incredible new GATS Jar allows a pilot to pour the fuel used in the preflight check back into the fuel tank without fear of water contamination. The jar uses a special separator screen that, when coated with avgas, forms a barrier to water and debris, yet allows passage of avgas. The GATS Jar also detects jet fuel in the event of inadvertent fueling of your aircraft with jet fuel. By using the GATS Jar, pilots can help protect the environment by pouring sample fuel back into the tank instead of on the ground.


Great product. This a replacement for a lost GATS tester.

Richard M Verified Purchase


September 14, 2021

Aircraft Spruce, as faithful as always getting parts to me on time

Steven F Verified Purchase


August 9, 2021

.Excellent product.

Craig S Verified Purchase


July 16, 2021

Works well.

Mauricio F Verified Purchase


July 7, 2021

Fuel jar allows for taking large samples which is good for removing debris from tanks. Easy to clean out if there is contamination, such as water or paint chips. Other testers are difficult to wipe out.

March 1, 2021

This hands down amazing! I was dealing with drips from my sample ports and I noticed some contamination in the old non-GATS sampler and figured I should try GATS to catch and remove the contamination. Sure enough, GATS caught a bunch of crap! I choose not to throw out samples and this tool makes it easy! Excellent product!

Robert W
October 10, 2020

Thumbs down. Only 5 star reviews go on top so beware - 1 star review here - these are such poor quality Compared to the older ones. A year of use and the o-ring has failed, the thin walls have buckled and its so sad that they no longer have the “spout” indent in the rim. Fuel does go everywhere unlike the original. I’m not bothering with trying to replace the o-ring, I’m going to find something better.

July 10, 2020

I am really happy with the gats fuel tester. Its nice to take a large sample especially when you do have contamination. It also feels good not wasting fuel and making a mess by dumping avgas on the ground. Yes the older one sounds nicer with thicker plastic and a pour spout, but this one works fine. Dont let that scare you away, this is the best tester I have used when fuel quality is concerned.

July 1, 2020

Great but I got the large jar and would get the smaller one next time.

Larry H
May 11, 2020

A great product - easy to use and you dont get fuel on your hands!

Don S
April 16, 2020


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Will this Gats jar work with Jet A?

Per the supplier: yes, it will.

Q: Is the 16 oz. GATS jar taller or larger diameter than the 12 oz. version?

It is the same size diameter, only taller.

Q: Does the GATS Jar come with the sump actuator or must I purchase one separately?

Yes, the GATS jar fuel sampler comes with the actuator. We do offer them separately as well in case the original gets lost or damaged.

Q: The Gats jar fuel sampler says it detects Jet A in Avgas, how does it do that?

The GATS Jar Fuel Tester uses the difference in the rate of evaporation between AVGAS and Heavier than AVGAS fuels to test for Jet fuel as a contaminant. The process is quick, simple, and once mastered is quite reliable. Immediately after the samples have been collected and examined and while the screen is still covered in fuel, blow gently and indirectly on the screen with your mouth from at least a foot away and observe the evaporation of the AVGAS from between the strands of the mesh. The AVGAS will evaporate quickly and continuously until it is gone from all but a few screen cells. If there is Jet fuel or another heavier than AVGAS fuel present a delay will be observed in the overall evaporation of the fuel clinging to the screen with a significant number of screen cells still containing fuel after the initial surge of evaporation. After a short interlude the remaining cells will begin to clear of fuel as the gentle air flow of breath over the mesh continues. This is the contaminating fuel evaporating from a slightly elevated temperature. The two different rates of evaporation is somewhat subtle and care must be taken not to overwhelm the process by blowing too hard on the screen. Once mastered, one should be able to detect Jet fuel contamination to as little as 5%.

Q: Are replacement gaskets available for the GATS Jar fuel sampler or must I buy a whole new jar?

In case of O-ring failure, if you contact the manufacturer by phone, email, or fax they will issue a no-cost replacement to you.

Q: I have a Columbia 300 which has a flush drain design that requires a 3/16 or 1/8 pin be shoved up into the assy to drain fuel. Does the gats have that pin? It is hard to see in the pictures

Yes, the Gats jar will have the pin to get a fuel sample from the drain valve.

Q: Running a jet that uses diesel and 2% turbine oil. Will the GATS jar fuel sampler still work to separate water with this fuel?

Per the manufacturer, yes, this will work.

Q: What does GATS stand for?

Per the manufacturer: The name is an anagram that initially meant Gas Analysis Test Separator. However, it works with all purely petroleum fuels including jet fuel and diesel fuel, so I could have called it the FATS tester but I thought GATS was better.

Q: Will the GATS jar separate water from mogas, or from a mogas/avgas mix? Im buying a Cessna 150 which is certified for operation on mogas or on a mixture of mogas/avgas Just wondering if the GATS jar will work for that. Thank you.

As long as it does not have alcohol in it, it will work just fine. It will work with all petroleum fuels and their petroleum based additives from diesel fuel to kerosene jet fuels, to all purely petroleum gasoline fuels of all octanes that are not mixed with alcohol or any other organic, water soluble liquid.

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