Question on CO2 regulator types
As I have been searching auction sites, I see a LOT of different models - I know Matheson/Harris/Victor/Airgas/Concoa/Praxair are all good names to keep an eye out for.
But the fittings... most CGA320 are expensive, but I've seen a bunch with CGA580 or CGA350 - I know the Mathesons (like the 8- or 81- series) are the same body, just with different fittings, but does it matter what gas it was originally used for? Are the seals sometimes different, or can we just muscle the old stem off, and put on a CGA320... Reason I ask is that I've seen a few Matheson single-stage 3320's and dual stage 8- models *real* cheap.
Does it make much difference, or is it really just input psi range, and output psi range, and the rest is fittings?
I'm upgrading to a regulator, and something like an Aquatek would be real easy to setup, but if I can source the all parts for $30-40 more than the aquatek and build my own, that'd be more fun, and a better regulator, no?
Last edited by ice9; 05-18-2017 at 04:38 PM.