Quote:
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Originally Posted by Risky
I might suggest that you thread the part at 3/8 instead of 1/4 for the bigger pump (assuming this is physically possible. It may or may not make a material difference, but some people will be attacted by any tiny reduction in restriction.
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I just finished comparing ID of various barbs designed for 1/2" ID tubing. Of the brass and poly models tested whether 1/4 NPT or 3/8 NPT, the internal flow path at the most restrictive point(through the barb), were all .37". The poly barbs that come with the HWLabs Black Ice Extreme radiators were a little bit better at .385". Of all I tested, the DD 9/16-18 NPT high flow barb has the largest opening at .40"!
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