GX PUMP GX-E-CS4-I PCP Air Compressor, Max 5800Psi,350W Powerful Motor | Super Quiet & Fast Fill ,Portable,Auto Stop ,Built-in Home 12V Converter, Water and Fans Cooling, 5 Hours Continous Work
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Availability:
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Arrives
Monday, Aug 3
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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 airgun compressor. The excellent cooling can achieve 5 hours of continuous work . Note: For the first use, it must be filled with neutral distilled water or antifreeze ( PH is about 7). Note: 1) you can only add antifreeze if it freezes in your area in winter. 2):Do not turn the grease knob until after 6 hours of use, otherwise will cause bad performance. then turn it one turn every worked for 6 hours. The new version now includes a hour meter.
- 15% Faster Filling Speed: Filling 0.5L Airgun or Paintball tank from 3000Psi to 4500psi ,only needs 4-5 minutes. Filling 0.5L from 0-4500psi, only needs 14-16 minutes. but filling 6.8L bottle from 0-4500psi ,will need 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.
- Built-in 110v to 12V DC Converter: Compared to the GX E-CS4, the CS4-I has a built-in converter for greater convenience. You can use car battery or household outlet as power supply. The machine is also equipped with a built-in oil-water separator .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. First confirm the maximum safe pressure of your gas cylinder, do not over-inflate, otherwise it will cause safety problems.
- Note: 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. Package includes: CS4-I pcp compressor, filling hose, 12V dc cable, 110V ac cable, user manual, accessory bag.
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. NOTICE:This CS4 compressor supports the max design pressure 5800psi, but the burst disc coming with compressor only bear about 5000psi considering safety pressure. If fill over 5000psi, it will be blown up. If you really need the higher pressure, put 1 more burst disc into the valve.
Brand: GX pump
Voltage: 12 volts
Recommended Uses For Product: pcp compressor filling
Power Source: Corded Electric
Noise Level: 70 db
Voltage: 12 volts
Recommended Uses For Product: pcp compressor filling
Power Source: Corded Electric
Noise: 70 db
Additional Features: AC & DC Adaptable, Automatic Shut-Off, Oil-Free Pump, Quick Inflation, Silent Operation
Maximum Power: 350 watts
Capacity: 6.8 liters
Maximum Current: 29.17 A
Air Flow Capacity: 11 liters per minute
Hose Length: 19.6 inches
Tank Volume: 6.8 liters
Maximum Pressure: 400 bar
Item Weight: 33.7 pounds
Material Type: Metal
Brand Name: GX pump
Included Components: compressor, hose, 12v dc cable, 110v ac cable, user manual, accessory bag
Model Number: GX-E-CS4-I
Model Name: CS4-I Portable PCP Air Compressor
Manufacturer: GX
UPC: 755642825145
Unit Count: 529.11 Ounce
Item Type Name: pcp air compressor
Manufacturer Part Number: GX-E-CS4-I
Color: Red+black
Style: Portable
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Aug 3
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
At first, I was planning on getting one of those many $200'ish pumps readily available on Amazon. Many even look a lot like the $500'ish ones reputable airgun supply companies sell as their entry level "branded" recommendations. Upon further research, I decided to spend more to get significantly better specs and happy that I did. This one lists a MUCH longer run times (like over 5 hours, the others are like 10-15 minutes at a time), so it CAN fill bottles (still skeptical so not likely to be used as such for me). It is also significantly quieter (based on online reviews and videos of the others). Its noise is literally a FRACTION of even my regular air compressor for cars. It doesn't come with a temp gauge, like many of the other cheaper versions, but this one is water cooled - so it probably doesn't have a heat issue (definitely not even getting "warm" from my own uses). I'm not sure if it comes with a water filter (claims to have one internally) so I got a separate filter (from them). Specs are overkill for my intended uses (direct fill of air guns), but my gun has a max fill capacity of 3 bars, and this one actually is capable of going to 4 bars (the cheaper ones are all 3bars). This might have been the only one I've found that is specced to 4 bars at this price point. Works exceptionally well, doesn't rattle like its overworking itself, is quiet enough to use in the house, and appears to have a good build quality. I think the cheaper ones may be a good alternative to the hand pumps (some actually costing the same surprisingly), but this one appears to be built to last a bit longer (especially if intended to be used casually like I am). Replacement parts seem to be available (but at this price point, I wouldn't be disappointed to have to replace after several years of use). I did have an issue with the water filter I bought separately (hookup error) and the support was immediate, real time, and helpful (same company), so the company has some credibility as well.
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Reviewed in the United States on December 4, 2025 by B-town Yocal
My experience with the GX-E-CS4-I Air Compressor is noted by these items: This unit was purchased and this review is based on my perceived value and the function of the unit. Features of this unit that influenced my purchase was quality construction, ability to fill 1.5-2 L bottles, availability of repair parts and ease of set-up. - Shipment was quick and well packaged. The compressor was in great shape when delivered to my door. - Very easy to set up with the written instructions. Just follow the steps and you're up and running in under 30 minutes. - The only assembly to this compressor was adding a coolant to the tank (I used anti-freeze) and connecting the hose. - I added the GX Pro Grade Filter while setting up the compressor for quality air delivery. This is something you should NOT skip if you are putting air into expensive PCP equipment. -Once I set the cut-off pressure and back-up pressure limit, everything performed without a hitch. I have now officially retired my hand pump and can fill my equipment and bottle without breaking a sweat. I'll update this review after using the compressor through the Summer. UPDATE 7/9/26: After running this compressor for over 3 hours total, I have a couple of numbers to run. Just filled up a 98ci (1.6l ) bottle to 300 bar and it took 42 minutes. For an FX DRS 700mm pcp it filled up to 230 bar in 9 minutes. No issues with the pump, filter or bottle.
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Reviewed in the United States on July 7, 2026 by HDSportsPhotography
Buy from GX Pump via official sources with CONFIDENCE, they will stand behind their products. I have already ordered their new high pressure filter system because I trust them to do the right thing when a need arises. Pump works great had a small problem solved quickly by GX pump with a Control Board replacement. Pump builds pressure well, quiet in operation, slow fill rate does not over heat. I have worked on high pressure air and NITROX systems in and out of military. The number one enemy of compressors pumps longevity is excessive heat. This unit controls heat buildup well. Use this unit within its designed duty cycle and I am sure it will provide a long service life before rebuild. I ordered a pump on 27 March 2025 it arrived and would not run for a very long and shut down. It was tried with many options as per technical support via GX Pump. The unit-built pressure on deadhead tests just would not stay running. The failure mode did mode did not match the symptoms of the trouble shooting steps. This was an out of box failure and GX Pump thru its Amazon Official Sales Point replaced unit very quickly. I knew the reputation of these pumps were of high quality and like all factory-built items a poor example slipped thru. The replacement unit arrived quickly via Amazon 4 April 2025 I unboxed it and ran it. The unit had the same build date on tag as the first unit, still I had high hopes. No joy, same indications. Shutdowns happened running on 110 VAC and on 12 VDC. GX Pump Technical support tracked it down quickly to a Control Board (the only common failure point of both voltage modes.) This only affected one supplier Control Board and GX Pump sourced Control Boards that are another supplier (different design see pictures) and sent them out quickly. GX Pump also posted a video instruction on installation quickly.
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Reviewed in the United States on April 30, 2025 by Tom K
I love this pump. clean two stage compression. pump never gets hot or bogged down even at 5800 psi. plenty of power. safe, redundant safety features. easy to read and set pressure gauge. took the cover off to look at the internals, great build quality though out.
Reviewed in the United States on July 12, 2026 by Bosshauss
nice and quiet vs others I have used. it sounds slow but fills faster than my old spritech which died after 4 years of hard use. the spritech was loud and slow but was way cheaper. sounded like a jet plane taking off. the gx cs4-i is way better liquid cooling is a plus and super quiet vs the spritech. so far its been reliable and fast filling a 36/4500 ci tank to 3000 psi in 14min. 24min to fill 68/4500 ci tank to 4500 psi from 1000psi the spritech choked at around 3800 psi. things i didnt like was i had to flush cooling system as there was junk in it from the start like old scaling not sure what it was but it needed to be flushed. second thing is lack of temp gauge. would be nice to know how hot the liquid is for the cooling system. lastly i dont like the fact that the power cord plugs in the front of the machine. i think it should be in the back. overall its a solid machine and works well
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Reviewed in the United States on November 10, 2024 by yamkipor
I first bought a cheaper compressor, but it started to fail in the first couple of weeks, so I decided to not mess around with inexpensive ones and got this one; It has been working fine, is quieter and faster than the small inexpensive one.
Reviewed in the United States on June 28, 2026 by Backroad
Excellent compressor! Has all the bells n whistles. Fast fill time. 68ci tank fill from 0-4500psi in 25 minutes. Have filled many tanks with great times. Can fill for 5 continuous hrs with no down time for large tanks. Big perk is it's extremely quiet! In addition has a grease pot which allows you to turn knob every 4-6 hours to lubricate the pump. Awesome feature! Have owned quite a few cheaper compressors n by far this one is superior. Costly but you get what you pay for. If your on the fence about buying this compressor it's definitely worth the cost. I couldn't be happier! Has good instructions with an itemized parts list which is great for if n when could need repairs. Don't anticipate that for a long time. Very pleased with this purchase! GREAT COMPRESSOR! Also has auto stop setting ability with a back up setting to your setting. Pump does not get anywhere near overheating due to the onboard water tank for great cooling of pump.
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Reviewed in the United States on September 7, 2025 by C M
I purchased this as a backup for a model just below this one. I have about 50 hrs run time on the old one when I blew out a pressure disk. I changed out the disk but had poor performance so I decided to try this new unit. Wow, it is quieter and seems to pump just as well or better. I use this at home, so no need to hook up the transformer like the old unit. Later went back to trouble shooting the old unit and found some seals on my service line and connectors had blown. Replaced seals and now have 2 excellent compressors. So when performance starts to decline, check your service line seals. They will probably be the first thing that fails on this well made compressor.
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Reviewed in the United States on January 15, 2026 by Amazon Customer