An ACDelco GM Original Equipment Vapor Canister Vent Solenoid is an emission control component and is a GM-recommended replacement for your vehicle's original component. This solenoid valve, when opened, allows air to pass in and out the vapor canister vent. The valve is closed during the EVAP system leak test. This original equipment vapor canister vent solenoid has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.