Four Seasons' expansion devices are specifically calibrated to provide proper flow to the evaporator as well as restricting or modulating high pressure liquid causing a pressure drop to lower the refrigerant temperature. They also provide optimum cabin comfort for both the driver and passengers.

• Separates high side from low side
• Regulates flow of liquid refrigerant into evaporator (Creates restriction)
• Refrigerant boils (evaporates) upon entering low pressure area in evaporator
• Refrigerant flows through fixed diameter tube- Diameter set by system design
• Flow rate determined by pressure drop across orifice & tube diameter
• Performance optimized at highway speeds
• Orifice Tubes are built application specific per OEM size and color