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Oren,

I have two Mark20/G500 sets and they do breathe very well.  
They also free-flow at the drop of a hat!  They do have an
adjustment which will help reduce this, but even with the
regs set to minimum sensitivity, they will start a violent
free flow if you take them out of your mouth and turn
them "mouthpiece up".

If you are going to use this reg, you probably need to 
have it detuned by your local shop, or use the little
keeper clips that come with it which plug the mouthpiece
when not in use.

This is not a reg that you can just clip off and let
it float around with the mouthpiece open.

I would suspect that my reg was out of tune, but
thats the way they both worked straight from the
factory.

YMMV.

Later,

Don W.

> Oren Harpaz wrote:
> 
> This is a question to any body on the list that has any experience with this
matter.
> 
> Many people advocate the use of the Scubapro MK20/G250, however according to
Scubapro the G500 is a better performer than the older G250.
> 
> I would like to know if any one knows if there is a difference around the
150m (500ft) range between the two, and which is the better performer.
> 
> Also due to the fact that Scubapro claim the G500 to be the best second stage
they have ever manufactured, is there any valid reason to prefer the G250 over
it.
> 
> I also know that many people who use the G250 on moderately deep dives have
many good things to say about the second stage, but my question relates to
deeper dives.
> 
> I would appreciate all of your comments.
> 
> O. Harpaz.
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