some basic stuff
a 1/4"NPT x 1-2"barb has an ID of 0.360"
a 3/8"NPT x 1/2"barb has an ID of 0.361"
a 3/8"NPT x 5/8"barb has an ID of 0.500"
if using 1/2"ID tubing, barbs in 1/4 or 3/8"NPT have the same ID
if a true 1/2"ID is desired it can only be done with a 3/8"NPT socket
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