Re: 3/8 npt to 5/8 barb
You are going to want to match the material of the hose barb adapter to whatever the 3/8 npt is mating to. 3/8 is not a typical thread size for bronze hardware so that's why it's hard to find. If it's brass then you can use brass for the application and brass barbs of that size are sold here:
Otherwise, you might try Grainger Industrial Supply - MRO Supplies, MRO Equipment, Tools & Solutions
They have a good selection of all sorts of fittings.
Downeaster 38 #40
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