Hi Ken,
a bit late but this site may have what you are looking for
Its also a great set of instructions on how to build your own cooler using old fridge pumps.
well worth a look.
Charles
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Does the tubing aperature actually have to be changed if the
compressed liquid type is changed? I'm not sure what the original
refrigerant was but the system is fairly ancient. Most likely I'd
have to change refrigerent types to a newer approved refrigerant.
Anybody out there have any ideas on what would be the best way to
proceed?
Looks like I might need to start a "compressed gasses" group...
Ken Hunter