It would be for a cooling water vent. These are located in a couple of places on the motor. You can actually see the top one venting when the motor is running.. On the bigger motors when hooked up to a garden hose you can see 3 to 4 different water vents. They are made that way to help keep your motor cooled off.
I also fogot to mention... Do Not Run IT Out Of The Water unless you have a garden house hooked up to it. Even for just a short time can cause it to over heat and also mess up your impella. The impella runs off your water pump to push the water threw..
Last edited by Phil from Maine; 06-04-2013 at 02:20 AM.