Quote:
Originally posted by DodgeViper
Barbs use a tapper thread (NPT). As you tighten the barb the Lexan is going to expand placing stress on the Lexan. This is why it broke.
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A pipe tap is also tapered to match this exactly so this is only a problem if the hole has not been tapped to the end of the tap, in which case it would have been done improperly. This is also btw the reason the male threaded end should be trimmed to the proper length when using narrow tops so that they do not bottom out and so that they can be turned in all the way. When properly done these possible problems are eliminated.