I finally got my COR-15 and I'm planning to re-plumb my return along with the FMK I've had waiting for a few months now. The COR-15 says for best flow to use 1 1/4" but the FMK is 1". Guess I'll just go from the COR-15 to 1" and run 1" all the way. Seems odd that these two companion products are at odds with each other. Or should I do something different? Thanks!
-Mike
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