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They all, well everyone I've ever seen, has had a regulator on it. Without a reg it would output all 3000 or 4500 psi which would make just about any paintball related air fittings fail. Not to mention the marker itself.
You can buy a tank without a reg, called a shell or something. It'll come with a hole in the end for installing your
Basically the guages are there for knowing how much air is left. CO2 tanks don't have guages because they're filled by weight, and the pressure is pretty constant until they're really empty.
Some HPA tanks have an afjustable output pressure and will have two guages on them. One reads in thousands like normal tanks, and the other is in hundreds to display the pressure going into the marker.
With that said though, the mini-guages used on the tanks aren't all that accurate. Mines been off by several hundred psi. They're just a reference. The fill stations usually has larger, more accurate guages on it for actual filling.
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