Coreless motor water pump

It is a simple, surprisingly well working water pump that works with a coreless motor with a 7.5mm-ish diameter. I put it on a foam boat, and it could push it around. I kept it water tight with some gum tape that is used for holding fabric/paper paintings on the wall. You may need to heat a thin metal rod up to melt the axle hole a bit bigger for the motor axle to fit.

Demo-
https://youtu.be/BzbZUcbrNx8
https://youtu.be/nZl9RfBeCL4