The Planted Tank Forum - View Single Post - Which should I get? Only found the following CO2 Regulators
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post #25 of (permalink) Old 02-12-2013, 01:31 AM
kevmo911
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Join Date: Sep 2010
Location: Greensboro, NC
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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:
http://www.concoa.com/specgas_catalog.html

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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