CS4-I Portable PCP Air Compressor, 350W Powerful Motor,Max 5800Psi/40Mpa, Built-in Home Converter, Water and Fans Cooling, 5 Hours Continous Work, 12V Auto Stop Paintball Air Compressor

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.

The media could not be loaded. After seeing a friend's CS3 compressor in action, I decided to buy the updated CS4-I compressor, and man, does it perform well!! Quiet, smooth, runs cooler than most due to internal cooling, and has a long run time of over 5 hours. This is a high-quality compressor with low RPMs that delivers HIGH pressure. It has no problem pumping to 310 bar/4500 psi. Very happy with my purchase, thanks to GX for making this available for PCP owners!To the reviewer who said his didn't pump out of the box... you should have tried closing the bleed valve. It is designed to NOT build pressure when this valve is open.

This is my first compressor. It was on the costly side of what I wanted to spend but after reading the reviews, I was 80% sure this was the one. We needed the ability to refill 2L scuba tanks in a hurry and this machine is a workhorse. While the others below $1,000 were fan cooled, this one is water cooled. Water cools it down like a radiator in your car. This machine can run for 5 hours without the need to cool down where the others were 25 minutes on, 25 minutes fan cooled.We easily refill 2L scuba tanks in half an hour. We bought a vibration time meter that is sticks to the compressor as it requires a full turn of the Grease Knob every 5 hrs. I’m told it’s like changing the oil in your car and very much required. I did make the mistake the first time of not closing the Bleed Valve and wondered why the tank wasn’t filling - rookie error, and probably the one the reviewer with one star made as well.The 12v inverted is built in so this unit is very compact, heavy but very compact. The instructions are straight out of China with poor grammar but still understandable. Haven’t had to communicate yet with the manufacturer so can’t speak to that.To refill scuba tanks traditionally, one must drive their tanks to a dive shop. It’s not on demand so you have to drive to the dive shop the next day too. Very inconvenient. With this compressor, we can literally be ready to jump back in the water in less than an hour! We can also fill tanks utilizing the 12v cable hooked up to our car in any isolated dive spot accessible here in Hawaii. A true game changer for what we need it to do! Go get yourself one and life will be easier and more fun!

Why did you pick this product vs others?:I am REALLY enjoying this purchase for my PCP Edgun 2 Leishy. I just filled my Great White tank (310 BAR/4500 psi) from empty in appx. 3.5 hours, and the compressor nor tank even got warm/hot. Super quiet for the power generated, and lots and lots of online reviews praising its reliability. Before using, be sure to watch a few youtube video's on how to set up and test with the dead head, and make sure to fill with distilled water and get all the air bubbles out of the line. I am VERY happy with this purchase, and really great value too.

Worked great for a month. Now, it takes 20 minutes to fill to 250 bar. It was a few minutes then it was 6 minutes, you get the picture.

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 1000psithe 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