hmm,it's quite different I think. Given the proper tuning of the durso I should be able to get about 3500gph, it handles the flow of my pump full out, and I have very little plumbing so head pressure is at a minimum. I think a 1.5" bulkhead should handle about 2200gph, I don't remember where I picked that up, but I remember reading it somewhere. The difference is quite substantial when you get into larger plumbing.
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