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Trying to seal threaded barb to a reducing female threadwhat are you trying to seal? old school teflon tape,or if perm,wet/dry pvc cement
Yes thats correct!Also were all assuming your mating plastic threads to plastic threads?
use this. wrap about 8-10 times around thread and don't over tighten and crack fittings.
That PVC cement will work.
BTW, watch this video. This is why most recommend pipe dope, like Teflon paste or Plastic Joint Stik over Teflon tape for PVC threaded fittings.