The sizes he is refering to are the NPT sizes not the barbs. You can just replace those barbs with whatever you want drom your local hardware store. For the inlet make sure the nPT thread is 1/2", and for the outlet make sure your nPT size is 3/8". And as far as the corresponding barb sizes, get what works in your system.
Keep in mind that the original barbs have o-rings. Very few fittings have these o-rings, but you can use silicone tape to get a good seal....
Brian W
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Water Cooled Inwin Q500 (Dual Rads: Rad1 = DTEK Pro Core | Rad2 = Blick Ice Estreme, Hydor L30, Dangerden Maze2, Bay Res Typhoon Reservoir, 1/2 " DD Tygon Thick Wall Hose).
Flow: Res, Pump, CPU watervlock, Y into both rads, both rads into res independently.
Athlon XP 1800+ (@ 1731 - 150mhz fsb.), on a Asus A7N266-c, and a Radeon 9000 *waiting for RMA'd Saphire 9800 ultra from Newegg)
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