Not of the barb part, but of the NPT part. You see there are two different parts of a Male threaded NPT Hose Barb. Both parts can have independednt sizes. For instance you can have a 1/4" NPT 3/8" Barb. What that is is a fitting with 1/4" Male NPT threads on one side and a 3/8" Barb to accept Hose on the other. The ID of the Threaded part will be around 1/4"+. The barb side will accept 3/8" ID hose, and its internal diameter will be slightly less than 3/8".
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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