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Excellent progress thus far. I see one potential problem with your 4-way plumbing - there are no ball valves near the actual unit. When you need to remove it (and you're gonna need to remove it at some point for cleaning or something) you are going to have a lot of water spill when you disconnect the unions. If I were you I would get some ball valves and a "T." The first time you disconnect your 4-way, plumb in a ball valve after each union of all four outlets, and put the T with another ball valve on the end between the CL pump and the 4-way. Whenever you need to service the 4-way in the future, you'll be able to close all of the ball valves at the 4 outlets and open the ball valve at the end of the T to drain the unit of its water. Hopefully there's already a ball valve between the pump and the 4-way as well, because that will also need to be closed during this procedure.
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The Dude abides
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