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I bought mine off of eBay. I went 1-1/4" PEX to 1.5" threaded fittings and from there it was easy to get a valve or union or whatever else I needed.
While that is very true, I was getting most of my other fittings for free and it was easier to plumb most of it in 1-1/2" for the thermometer wells I was using and the pump flange fittings.