Centrifugal Water Pump for The Catfish/550 motor

This is a new centrifugal water pump for my MakeItFloat challenge submission:

The Catfish - A fully working submarine
http://www.thingiverse.com/thing:920376

This pump has been rebuilt to fit a 550 motor with a water cooling jacket:
http://www.hobbyking.com/hobbyking/store/__19444__Water_Cooling_Jacket_for_36_Size_Motor.html

The small hole on the side is for priming the pump and water cooling the motor.

Update 7/16/15:

All new files - entire_thing.stl is now for reference only