Where do you hook up a water hose to a 780 polaris to run it to check it out before you put it in the water?

To hook up a water hose to a Polaris 780 for testing before putting it in the water, locate the water intake fitting on the hull, usually near the jet pump. Attach the hose directly to this fitting using a proper adapter if necessary. Make sure the hose is securely connected and turn on the water supply to test the engine and cooling system without needing to launch the watercraft. Always ensure the engine is running while water is flowing to prevent damage.