CARQUEST Orifice Tubes are designed to regulate the flow of refrigerant through the air conditioning system to provide optimal cooling to the passenger compartment. They are manufactured to meet or exceed original equipment specifications. Product Features:Automatic Adjusting Orifice TubeEach orifice tube is tested for function and leakage according to OEM specifications to ensure optimal performance of the air conditioning system.O-Rings necessary for installation are included.