You can turn the motor over but I wouldn't let it run without water running through to keep it cool. The flush adapter is on the back of the boat next to the jet pump (where the propeller would be on other boats). You should see threads where you screw the hose in, it's usually in the upper left corner. As for the quick connect, it will allow you to connect the hose without having to twist and turn you garden hose which can be difficult in that tight space.