Originally Posted by CI GS

I would prefer to use a radiused hose end for the 90* to come off of the tank, even if you use a straight NPT fitting to screw into the tank instead of using the ECS bulkhead (which is a nice piece of kit, albeit too pricey for some). The reason for this is that most 90* NPT elbows are drilled from both sides and have a large step in the corner than restricts flow. See photo below which explains it better than I ever could:

Originally Posted by CI GS

I would prefer to use a radiused hose end for the 90* to come off of the tank, even if you use a straight NPT fitting to screw into the tank instead of using the ECS bulkhead (which is a nice piece of kit, albeit too pricey for some). The reason for this is that most 90* NPT elbows are drilled from both sides and have a large step in the corner than restricts flow. See photo below which explains it better than I ever could:

Originally Posted by realcanuk

Aeroflow makes full flow fittings in various configurations. I guess others would too but I like them.

https://www.aeroflowperformance.com/...gs/af543-10blk

Originally Posted by CI GS

Nice. Do they make an AN to NPT 90* like that too? I've never seen one, but it would be good if they do.
What I was referring in my earlier post was the typical 90* NPT elbow. Every one I've ever seen has a step left in the corner from when the elbow is drilled from each end.