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I don't follow prices and to be perfectly up front, the last time I checked the CII was $1995. If you gave me a choice between the two machines, I'd take the CII all day long. Whether it's worth several hundred extra is the buyer's conundrum.

The Carette II is a head and shoulders superior design compared to any GX compressor. It is comparable in quality to Coltri, IMO. I understand the OP's concern regarding the reputation the U.S. distributor has concerning service issues. Most if not all of these problems were about the water...

The OP is an Acecare employee. They are looking for marketing feedback and free advertising with their posts.

The question is how long can a compressor survive pumping up to 7000 psi? The GX CS4 seems to be a better value and has a better longevity record than any of the oilless box compressors, let alone one that pumps up to 7K psi.

There are three things that can cause a sealing o-ring to blow. Sometimes it can be a combination of factors. First cause is using a too soft durometer o-ring like ones that come in an economy priced o-ring kit. A 70 or 90 duro buna o-ring is required. Second cause is a valve that is either...

Alkin W31's hold 550ml or 19.35 oz. of oil. A gallon of oil should provide 6.7 oil changes. Alkin's W31 users manual recommends Anderol 755 or 750. Secolube 500 is Filtertechs equivalent of Anderol 750. The difference in the two oils is one is a triester and the other is a diester. I don't...

Alkin 755 oil is Anderol 755 rebranded. It can be seen on the photo at the bottom of the container. Bauer, Coltri, and Alkin all sell oil that they buy from oil manufacturers. Filtertechs sells Secolube 800 which is the same as Anderol 755. I've been using Secolube 500 which is equivalent...

It's a 1/4 NPT thread. Very common in the U.S. for any gauge 2" diameter or larger.

I have several different fill connectors for the W31. The one I use most is the DIN300 since it provides a rigid connection. One of my tanks has an HP3 valve which fills through a male foster. Alkin sold me a female foster connector that threads directly to the fill hose in place of the...

Alkin compressors have a fill hose and assembly that comes with the compressor. You specify which connection your tank uses when you buy the compressor. Alkins will fill with a microbore hose but why would you use one when the factory fill whip can connect to your tank?

Factory specifications are 11 liters per minute for the CS4 and CS4-i.

If you find no leaks the probable cause is the high pressure piston rings are not sealing and need to be replaced. They are made of a pliable plastic resin infused with some type of metallic powder. Buy Tuxing rings only as other brand replacement rings won't seal. Be careful when reattaching...

+1 to what Avator recommends. The Hill is more of a direct rifle fill compressor than a bottle fill compressor. It can fill a bottle but produces more heat and has several cool down cycles per fill. The GX-CS4 is nearly the same a JTS Comp100 at a much better price.

The PCP has a check valve inside. The tank valve is closed so the only air that will be released under pressure is inside the fill hose. If you are impatient and won't dry fire the rifle to lower the pressure you can put on hearing protection and just pull the probe out of the rifle. You'll...

I tried increasing the Alkin's pressure relief to 4800 psi several years ago. Even though an Alkin is robust I noticed that my electrical system and the Alkin's motor were laboring after the pressure exceeded 4500 psi. The wear and tear was not worth an extra fill or two so I went back to the...

@OldVet, you need a non detergent synthetic compressor oil made specifically for high pressure compressors. Most motor oils have detergent additives to suspend contaminants which are removed by an oil filter. Air compressors don't have combustion so detergents which don't allow contaminants to...

Rubbing alcohol, Goo Gone, or a soap solution like Dawn dishwashing soap and water. Glycerine is easy to clean up with most grease cutting products.

Don't waste your money on this tank. It has all the disadvantages of a scuba tank and no advantages of a carbon fiber 310 bar tank. It's purposely heavy for diving yet only holds 3K psi, it provides very few top offs, and it's not that cheap. Since you already own a compressor, search the...

The factory lists the fill rate for a CS-4 as 11 liters per minute. There are 2108 liters of compressed air in a 6.8L tank filled to 310 bar. 150 to 300 liter PSI fill therefore should take 86 minutes.

@LRP as others have said, it is a type of stretchable plastic that is infused with copper powder. If they cost a dollar apiece on Amazon you can get them even cheaper on Aliexpress if you are willing to wait. Tuxing might even stock them in the U.S. Even if they cost much more it would take...