The Planted Tank Forum - View Single Post - Which should I get? Only found the following CO2 Regulators
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Old 02-12-2013, 02:31 AM   #25
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No, that's a single stage. A dual stage will always have some sort of "bump" behind the gauges. Look at the pics for the other 3 listings if you type in what you have in caps, specifically the pics of the back end of the regs.

Here's a current Concoa series listing with .pdf's:

Not sure exactly what the first one (the one you specifically were referring to) is, but the other 3, which are pics of the same reg, are 412's (duals).
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