ACDelco GM Original Equipment Windshield Washer Check Valves are GM-recommended replacements for your vehicle’s original components. Windshield washer check valves allow fluid to flow in only one direction to the washer nozzle, and help keep washer fluid from flowing back into the reservoir. These original equipment windshield washer check valves have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.