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Availability:
Only 1 left in stock, order soon!
Arrives
Tuesday, Oct 27
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Features
- GX Patented Design :GX features an exclusive four-stage compression system paired with an integrated water-cooled compressor structure, powered by an genuine 350W high-performance motor. It is very stable when working, and it is very quiet with only 70db. At the same time, it is equipped with a double-pointer pressure gauge, and the two-level setting auto-stop pressure, which is more secure. This distinguishes it from others, which merely add water circulation devices to small shoebox-style compressors on market.
- A water tank and a grease tank are designed on the top of the compressor. The excellent cooling can achieve 5 hours of continuous work and can fill a 3L gas cylinder. Note: For the first use, it must be filled with about 300ml of antifreeze ( Distilled water is not recommended.). Note: 1) Be sure to add neutral antifreeze if it freezes in your area. 2):Do not turn the grease knob until after 4-6 hours of use, otherwise will cause bad performance. then turn it one turn. Search "how to add coolant for cs4" on youtube to learn the correct steps.
- 15% Faster Filling Speed: Filling 0.5L tank from 3000Psi to 4500psi ,only needs 4-5 minutes. Filling 0.5L from 0-4500psi, only needs 14-16 minutes. Filling 6.8L from 0 -4500psi, needs 2 hours and 40 minutes. Notice: CS4 and CS4-I are mainly used for high pressure, small gas cylinders below 6.8L, especially PCP. It is not recommended to fill large gas cylinders. Otherwise, you can choose 5K1 and 5K2.
- 12V DC input, you can use car battery or household outlet for power supply, equipped with 110V-12V converter. The machine is equipped with a built-in oil-water separator which is not a cotton filter and never needs to be replaced. This is an ideal choice for airgun . Suggest to buy GX professional external filter if you need enhanced filtration performance.
- Please read user manual carefully before turning on compressor. Quick connector : M10*1, 8MM female connector. Product size: 11.8*6.1*12.4 inch , weight: 29lb. ATTENTION: when filling is complete, please close the bottle valve first (when filling bottle) and then open compressor's bleed valve to release line pressure . All pressure must be released from compressor before starting.
- Note: 1, when add coolant first time, add full tank, turn on switch (don't press start button), water pump will run, coolant will flow into inner water pipes, then keep adding more coolant until water tank is full. 2,The new version has updated the timer and the minute readings, but the readings received by each machine are random.
- Note 3: The panel has been updated with an overcurrent protection switch, which will cut off power in case of excessive motor current. In this case, operation needs to be stopped, the pressure relief valve loosened for cooling, and the check valve flushed with water should be attempted.
Description
Compared to the small, boxy compressors on the market, GX features a patented structural design for the CS2, CS3, CS4, and 5K models, with different compression mechanisms. Years of continuous improvement, such as the addition of roller bearings at the top of the connecting rod, allow for better movement and less wear on the rod and wrist pin, significantly extending service life and enhancing performance under high pressure. CS4/CS4-I pcp compressor GX pcp compressor filter 5K1 pcp compressor 5K2 pcp compressor CS3/CS3-i pcp compressor CS2 pcp compressor
Brand: GX pump
Voltage: 12 volts
Recommended Uses For Product: pcp compressor, paintball tank filling
Power Source: Corded Electric
Noise Level: 70 db
Voltage: 12 volts
Recommended Uses For Product: pcp compressor, paintball tank filling
Power Source: Corded Electric
Noise: 70 db
Additional Features: AC & DC Adaptable, GX PATENT, Portable, Quick Inflation
Maximum Power: 350 watts
Capacity: 6.8 liters
Air Flow Capacity: 11 liters per minute
Hose Length: 19.6 inches
Tank Volume: 6.8 liters
Maximum Pressure: 400 bar
Item Weight: 29 pounds
Item Dimensions L x W x H: 11.81"L x 6.1"W x 12.4"H
Material Type: Metal
Item Highlight: Super Quiet & Fast Fill,Hour Meter,Portable 12V Auto Stop PCP Compressor ,Water and Fan Cooling, 5 Hours Continous Work
Brand Name: GX pump
Included Components: compressor, hose, 12V converter, ac cable, user manual, accessory bag
Model Number: CS4
Model Name: GX-E-CS4
Number of Items: 1
Manufacturer: GX
Unit Count: 529.11 Ounce
Item Type Name: pcp air compressor
Manufacturer Part Number: GX-E-CS4
Color: Red+black
Style: Portable
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Oct 27
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I was looking for a better replacement for my Yong Heng compressor and purchased a GX water separator filter and noticed the filter to be well thought out and built like a tank. I was impressed so much with the filter build and performance I decided to purchase a GX GS4 compressor. Upon opening the packing crate I removed the compressor and read the instruction sheet. Imagine an instruction sheet with a compressor. (Some do-not. have one). I live in Utah wher winters get cold. My compressor would be in my shop so used a 70/30 mix of green antifreeze with distilled water and had a 7 ph factor. I bought the compressor to mainly fill my 6.7 L tank. I started the fill procedure as per directions such as opening the vent to let compressor start then closing vent to prevent the compressor from starting under pressure. 3.4 hours later my carbon fiber 6.7L tank was full at 4350 psi. I shut of compressor but let the coolant flow through the compressor to cool it down. Over the time filling the tank it never got really hot as the coolant radiator and fan worked great to keep it cool. It has a pressure shut off and a back up shut off for safety. The compressor is fairly quiet in its operation. The quality of the build is amazing. It is really built strong and for reliability. It does not struggle to fill the 6.7L tank. Most of the other tanks need a cool down period filling tanks that size. I am not only impressed with its capability, but also the machining, and quality of the unit. The unit will compress air to 5800 psi and has safety devices to keep excess pressures from causing issues. This is a PORTABLE unit and weighs 29 lbs and can run on 12 volts or 110v. It uses 345 watts with compressor on. I tried to save money on lesser quality compressors but they did not perform well or died within a few months. This GX compressor is not that more expensive. It truly is a well made compressor of quality workmanship and design with safety systems and pressure back up switch (2) to keep you safe. I appreciate the safety as well as the unit. NOTE: If you have any high pressure compressors look into the GX Drain Filter as it by far is the best strongest oil and water pcp filter out there. I am not affiliated with GX but after buying the compressor and filter I am and will be a GX customer. Dr.Dave. Utah. UPDATE…. I have been using this compressor filling my AirForce Texan LSS .457 an AirForce Condor SS and Air Venturi Avenger and a SCUBA tank to fill my other pcp airguns out in the field. I have had no problems with the Compressor. I did add a timer to know when I should change oil in the compressor. I would buy this compressor again as it is a workhorse and is quieter than most and coolant cooled so no overheating issues. VERY HAPPY with purchase. Update: This compressor works just like it did when new.. No, Problems or even small issues. Has already outlasted my Yong Heng compressor. I do use the GX Coalescent filter that really stops water from getting into gun or fill tank. I added a battery operated timer to it. That filter is really innovated and works GREAT !!!
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Reviewed in the United States on November 17, 2025 by DrDavid S DeMasi
I bought this in early 2024 and have used it almost every two weeks since the purchase. I wanted to give it time since I've had several similar pumps fail within a year's time frame or within a couple of months. This unit although it was a little bit more expensive was well worth the money. This thing is Rock Solid so far and shows no signs of failures and has been extremely quiet and efficient. I would highly recommend this to anybody looking for this type of equipment.
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Reviewed in the United States on August 1, 2026 by Dean Amos
I'm absolutely thrilled with my new GX-E-CS4 pcp air compressor. As an avid air gunner, I was in the market for a reliable, high-performance pump that could handle my needs, and this one has exceeded my expectations. One of the standout features for me is the ability to pump up to 400 bar. I own a Huben GK1 air pistol that is rated for up to 350 bar, so having that extra headroom is fantastic. I can now fill my pistol to its max capacity without any issues. The compressor handles the task with ease, and I'm impressed by how quickly it can fill even my larger air cylinders. Another feature I really love is the water cooling system. I've had troubles in the past with other pumps overheating when filling larger volumes, but the GX-E-CS4 stays cool and composed even when I'm filling my 6 liter bottle. It's so convenient to be able to top up my air reserves without having to worry about the pump conking out. The price of this compressor is also amazing considering all the functionality and performance it offers. I was a bit hesitant at first, but after using it extensively, I can say with confidence that it's worth every penny. Finally, I have to mention the stellar customer service I received. I had a minor issue pop up, and the company was quick to diagnose the problem and send me a replacement part. Their responsiveness and willingness to stand behind their product is refreshing. Overall, I highly recommend the GX-E-CS4 to any PCP air gun enthusiast. It's a game-changer!
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Reviewed in the United States on April 18, 2024 by prototask
I really like this compressor. It a set the pressure stop, turn it on and forget about it. I was worried at first and didn't trust the automatic stop, but after a hundred or so fill ups, it works perfect. Its accurate too. I have it set at 3k psi and it matches the small handful of PCP airguns gauges. Fill time is plenty quick in my opinion and the decibel level is bearable enough to run inside the house. It's quieter than my shop compressor by a wide margin. I bought Amazons extended warranty which makes it the best insured value for a compact compressor on the market. If I was to have one complaint, its that the external power inverter doesn't have an on/off switch. I continuously have to plug and unplug it in for use. I'll be buying a switched power strip to solve the annoyance. But other than that, this compressor is great. I'm glad I invested in it for my hobby and would do it over again without hesitation. If you're on the fence abut such a large purchase, if you commit, you'll be happy you did. It's made filling my tanks and PCP's so easy.
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Reviewed in the United States on March 4, 2024 by a.p
Used this compressor a couple of times to fill my PCP and, wow. Great quality, worked right out of the box, no leaks, no problems. Haven’t used long term yet, but so far so good. Some stuff no one has mentioned/ details: 1) The instructions are pretty good, and state that the air coming out of it is dry and suitable for breathing purposes. I wouldn’t, but that is what it says. It gives detailed instructions for first time and then repeat startup procedures, and is written in readable English. It also has a full exploded parts diagram and parts list. 2) I went with a no-compromises set up, with an additional oil-water separator and an additional in-line drier and they *don’t seem to be necessary*. The compressor has a built in oil-water separator that works quite well! After filling, the bleed on my extra external oil-water separator was bone dry, and the bleed on the compressor itself spat out water as expected. I cautiously say you don’t really need an additional moisture solution if you live in dry or semi-dry climate. 3) The air hose it comes with are standard air rifle Foster type quick-connects on both ends 4) It wasn’t clear but the water cooling is actually a small very good functioning radiator and water pump. I was worried it might have just been a water jacket for the thermal mass, but that is not the case. The instructions say over and over to fill the water first before turning it on. Mine actually came with the water reservoir about half full of water already, so even if you were dumb and didn’t fill it, it probably wouldn’t have ruined the water pump outright. 5) The AC-DC converter appears to be of good quality and works well so far. 6) Comes with a quick-connect plug for the air line, and instructions that with the plug in place you should get 250 bar in 38 seconds or so. I confirmed this. 7) Took about 10 minutes to fill my ~600 mL bottle from 100 to 250 bar, including the extra volume of the external oil-water separator and big drier. It would probably be a lot faster without the extra volume, as stated above in point #2. Since I have them, though, I will continue to use them. 8) The automatic shut off with double-redundancy is, in my opinion, a critical safety feature. I couldn’t imagine filling a potentially dangerous high-pressure air device without one. 9) Manual states it can be used vertically or horizontally, in case that matters to you.
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Reviewed in the United States on October 1, 2023 by cb
I’m just getting into air guns, What a rabbit hole this is lol! But great fun! Costly! I haven’t had any other compressors to compare it to, other then my hand pump and let me tell you, it’s much heavier to carry around then the hand pump but it’s a lot easier and faster to fill! I did some research on these things and have friends that have compressors and prices and capabilities vary. My thoughts on this product, it was packaged well, assembly was simple, easy to use, filled my gun quick with minimal noise. I really like it, seems to be built well I hope I’m correct and it last awhile
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Reviewed in the United States on February 5, 2024 by Gary
Ive only had the pump for a few days. I was tires of the down time and everything else involved in filling bottles. My main use of my PCP is target shooting and pest control on my property. Filling my PCP directly from the pump seemed much easier. So for I've very happy. Its quck and easy to use and it meets all my expectations. Setup and use the first time was a little intimidating but its very straight forward and I highly recommend the setup.
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Reviewed in the United States on June 9, 2026 by Michael L.
As advertised works great quite
Reviewed in the United States on August 5, 2026 by ED