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Originally Posted by JamesAvery22
I went tiwh 3/8" npt nylon fittings. Putting teflon tape over the fittings actually helped a little but I still had to give a great deal of torque to get them all the way down.
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NPT is a tapered thread. It should start sloppy but tighten and eventually seize up as you screw the parts together. Normally, some thread will still be visible when the joint is done.
EDIT: If you really want to get the barbs off, put the joint in the freezer. Both metals will contract away from each other.