Headlight Washer

They were required on some high-output headlights. Nozzles pop out of the bumper. They use washer fluid. EU rules have required headlight cleaning for headlights above a certain light output, which is why many xenon cars have washers. Some cars activate them automatically every few uses of the windscreen washer when the lights are on. Damaged nozzle covers are a common bumper repair item.

A pump sprays fluid at high pressure.

Frozen nozzles can be damaged. They use a lot of fluid.