I didn't get this for windshield spray but for a project where I needed to move water between two containers. I suspected that this might work backwards based on the position of the barbs on the hose and I can confirm that it does. There are arrows showing the direction of flow, but if you swap the power wires, the pump will pump in the opposite direction. It has an impeller with flexible blades, so it's self-priming, although it's probably best not to let it run dry for very long. As others have pointed out, the point in the description that says the tank is on is FALSE.
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