I am doing the finishing touches on my twins and I need to know what NPT is the feed side of a HT3B turbo, I would appreciate any input thanks

 

the ones i have played with were not npt size. they are a 9/16-18 if i remember right. i used a sae 0 ring to jic hose adapter. part #2F351. and a npt to jic hose adapter part#2F297 and a hose 2F713 that is 24"s long. but it was almost to short. this is all from grainger catalog and was under 20 bucks for all 3 items if i remember right.