Needle valve source

One of the folks I've corresponded with has located a source for Nupro
needle valves for CO2:

> Nupro valve model B-4MG2 (about $38):
> Minnesota Valve & Fitting Co.
> 15901 West 78th St
> Eden Prairie, MN 55344-5799
> (612) 937-1160
> They ship UPS and accept MasterCard over the phone.  Dave Thorsen is the
> sales rep for western WI.

Thanks to Augustine Rodriguez <auro1013 at discover-net_net> for doing
the legwork.