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.

I have owned 4 different HPA compressors since the 1980s, including 2 of the earlier GX CS3 series models. This one has performed well over the past year and is able to refill bottles with no problems so far. If you are running it in a hot room or for a very extended period of time you might consider removing the outer metal case and using a strong fan to blow across the motor and pump. It isn't necessary. But heat buildup is hard on mechanisms like this. The internal fan cools the pump sufficiently but the internal metal parts (motor and pump) still get quite hot to the touch during use. With the case removed and a strong fan blowing across the mechanism it remains warm to the touch but never hot.

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.

I bought this to fill my 6.8L air tank to 5200psi and my Karma Red Panda to 5000 psi. The listing says that it can produce 5800 psi. I thought that at the price listed, it would perform. No so.It took over an hour to top off my 6.8L tank from 4500psi to 5200psi.It too more than 40 minutes to fill my 1L tank on my Karma Red Panda from 1700 psi to 5000 psi.That is totally UNSATISFACTORY. No doubt about that!I email the seller for assistant but no response.Additionally it is difficult to set the desired pressure on the gauge.I am returning this.

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

I only had the compressor for two maybe three days but what I can see now it is very good I have three other compressors and this one seems to beat them all as of now, very quiet fast and the this thing just works it works very good I am thrilled and very happy to be a customer. This is a honest to God review of the compressor I have bought from Amazon thanks