Hallelujah! Dan finally announced today that he's found a source for the unions he needs for fitting pipes - which ends a months-long quest to find supply sources for the various parts needed to install solar water heating systems on a large-scale basis.
Solar thermal guru Bob Ramlow tipped him off that Caleffi, a European solar products manufacturer, makes the elusive part. Hot Water Products, our distributor in Milwaukee, carries Caleffi products, but had been unable to locate that particular part. Turns out it wasn't listed in the catalog - but it is available!
Bob also relayed the information that Nibco makes an acceptable copper/brass union, if you dope it up really well. Those are available at most large hardware outlets.
(I never would have guessed finding parts would be such a challenge. Funny what you learn when you're in business!)
In any case, now we have at least one supplier for every item needed. That will make future projects MUCH easier to implement!
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