From another search i found this site: http://www.russellperformance.com/
A quote from their site:
"While on the subject of pipe threads, we need to pass along that the nomenclature used for specifying pipe thread sizes can be quite confusing to those not familiar with pipe terminology. When a pipe thread size is given, such as 3/8" NPT (National Pipe Thread), the 3/8" refers to the inside diameter of the pipe."
I have also measured various fittings and have found the above to be true.
The ouside diameter on the threaded area is indeed 5/8", but that wasn't what he was asking.
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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