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RE: CO2 regulator problem

You may have a gauge malfunction. You do not say if the gauge reads 28 psig 
when not attached to the cylinder. If so, replace the gauge with one of the 
same range.

If the gauge will read zero when unattached, and jumps to 28 when pressure 
is applied to the inlet side of the regulator despite everything you do, 
you may have a regulator malfunction. If the outlet pressure changes when 
the flow varies, you may have debris in the mechanism or a leak in the 
diaphragm. If the outlet pressure remain constant with varying flow rates, 
you most likely have a damaged regulator. These can be repaired at no small 

M3 should be willing to help you with any of these issues.

machines with very powerful springs. Many people unfamiliar with the 
internals of the regulator have experienced "rapid, uncontrolled 
disassembly with associated component launch". This may become painful 
and/or require dealing with your insurance provider if you happen to be in 
the trajectory of one of the components.

Shireen Gonzaga
> 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
> the tanks.
> Any help would be appreciated.
> thanks,
>     shireen