Quote:
Originally posted by JimS
These are tapered NPT threads, meaning the farther the barb is screwed in, the tighter the fit and seal. Metal expands and contracts, poly tops don't. Metal expands, cracks poly top. Or, barb is screwed in too tightly, cracks poly top. Or a combination of the two.
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Good point! I forgot about that!
I'd recommend the plastic barbs, also because one would want to get away from the galvanic corrosion that any other metal than copper would create. I don't care if it's Stainless Steel, or Brass, it will cause galvanic corrosion with copper.