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CO2 regulator problem
Hi ... need some help from the experts! I have an M3
regulator attached to a hexa-manifold (6 needle valves).
While swapping out canisters earlier today, I noticed that
the output pressure gauge would not go to zero. The
cylinder pressure gauge showed normal reading (800 psi).
However the output pressure gauge would not go
below 28 psi. I've tried taking apart and re-attaching the
regulator, adjusting the regular screw and needle valve
to get rid of any pressure that could be trapped. Nothing
worked. Does anyone know of a trick I could use to get
the output regulator gauge reset to zero? Or do I have a
defective regulator that needs to be fixed? I'm reluctant
to attach it to my aquariums because I'm worried the CO2
output could become unstable and send too much of it to
Any help would be appreciated.