ok, i don't know what is going on here.
when you say "1/2-1/2(for 1/2" tubing) and 1/2-3/8(for 3/8" tubing)" and the last one is exactly the right size for the outlet, then the second figure, 3/8" is correct, since it fits the outlet. but how is it that it is 1/2" and only fits 3/8" tubing? are the two fittings, the one for the inlet and the one for the outlet, are the hose barbs the same size? if not, then you have a 3/8" x 3/8" hose barb, not 1/2" x 1/2". because since they both are 1/2" (for the first of the two measurements) they should have the same size barb, just different sized backsides. get it? there is no way that both can be 1/2" and one fits a 3/8" hose.
look at the fittings, and tell me if the hose barbs are the same, if they are, then you are all set. but if the outlet one only fits 3/8" ID hose, then you definitely have in your hands a 3/8" x 3/8" hose barb.
i am sending you some pictures, that will illustrate this. i will send to your email listed here.
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