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Originally Posted by Richer
The documents that come with a mag pump suggest doubling pipe size for the pump. So if your pump has a 3/4" input/output then a 1.5" pipe is suggested. Several people who have switched from a smaller pipe to the recommended pipe size report seeing a nice increase of flow in a mag pump.
-Rich
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bingo!
i'm not sure about how large the holes need to be, but i think it's larger than the bulkhead by a bit (obviously) like a 2" hole for a 1.5" pipe, which really, is only 1/4" of play before you tighten it. and yes, I run a mag12 on 3/4" pipe and i'm changing it whenever I remember to stop at a store for some pvc...i'm pretty lazy when it comes to that