The original MCW5000 had a top that allowed the bulk of the water to avoid the pins. Bill's design change was the "dropped deck" top that forces water to actually go through the copper pins of the base. That modification is the MCW5000-A. The MCW5002 is the same MCW5000-A design with the 1/2" push in fittings replaced with 3/8" NPT threads for hose barbs.
I think anyway
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