Going to replace my GEN X PCX40. I'm excited - I expect to see less power draw and more flow. So, the return hole in my sump is currently sized for a 1" return and now I need to enlarge it for a 2" return. I know there are many reeflo fans out there - what size return / bulkhead do you REALLY use? Any advice on how best to widen the hole? A 2.5" (or close) drill bit seems cost prohibitive.
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