You cannot change the Female threads on the pump. Just buy your pump, take it with you to the hardware store and play with fittings until you find what will work best for your particular setup.
I use 1/2" ID 3/4" OD silicon tubing throughout. I have a Eheim 1250 and I use 1/2" PVC and 1/2 " Copper tubing for my connections. I have a Maze 2 which uses 1/4" NPT 1/2" Barb. In my system the block is most restrictive, ie fastest part of loop. That is ideal. Keep the rest of your system wide and keep your block restrictive.
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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