[kwirky]

Originally Posted by Marlin65

I found that as well so use them the other way around if I can. Threaded part in.

i've used them that way as well. that way you can monkey around with the plumbing inside the tank too, in case you ad locline down the road or an eductor or the likes. or even convert it entirely to something else.

here's a thread where I found out the various hole sizes for the cheap black bulkheads and speares bulkheads http://www.canreef.com/vbulletin/sho...light=bulkhead