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All that's well and good, but don't forget that often times a fitting "size" does not match the true opening size. eg, NPT pipe sizes are "nominal" and never is the inside diameter of NPT equal to the "size". As another example, tubing fittings often have IDs much smaller than the "size". A 3/8" tube to NPT has an ID of only 0.22" on the hose barb end.
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This caught me out recently, I was measuring the inner diametre of my pump outlet and it was 3/8inch exactly, I thought it was a 3/8Barb, but it was a 1/2 barb. where's the logic?!
. to make it worse it all depends on the manufacturer, they're all different sizes. I'll be using 5/8 barbs/fittings on anything I do myself from now on
, specialy equal
Y fittings, ect...