A cheater way is to not use a bulkhead.... if you get a male threaded 1.5" PVC fitting, a flemale one and a soft O-Ring you can make a bulkhead out of it pretty easy. Cut the female threaded fitting off to use it as a tightening nut, and now you have a 1.5" PVC fitting in a 1.5" hole. 1.5" can flow 1200+GPH pretty easy, I was getting 1200+ on mine when it was duroso, now much more as herbie. Specs say 1600GPH, with gravity feed.
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