What would have less restriction two 45's or two long sweep 90's?

[NOLAGT]

I'm not sure that adapting to the outside threads is a good idea.

The inside threads are what are called a "tapered thread" - the diameter of the opening decreases slightly as you go in. A male tapered thread fitting gets slightly larger in diameter. This causes the threads to fit tighter and tighter as you tighten the joint.

The outside threads on your bulkhead aren't tapered, they designed just like a bolt. You might be able to make it work with plenty of teflon tape, but it isn't the "correct" way to do things.

I would definitely use the regular 90's. Like I said earlier, long-turn or long-sweep 90's are meant for drains, not pressure systems.

I am on to using the reg 90's now.

So don't do the outside of the bulkhead huh....ahh O well then. I didnt know about the tapered part...I was just trying to get everything out of the pumps that I could.