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Orifice Tubes
The AC Orifice Tube is much like your AC Expansion Valve, though they look a little bit different from each other. Your Orifice Tube forces the restriction in flow of restriction. This causes the refrigerant to go from high pressure to low pressure. These tubes are typically pretty small and contain a small screen on the inlet to protect the tube itself.
One of the benefits of the orifice tube instead of the expansion valve is the that there are no moving parts in the Orifice Tube. It is a straightforward, simple design that allows for very little error and malfunctioning. Orifice tubes can be identified by the OEM part number, and the color is also a helpful indicator in most cases, although we definitely do not recommend using the color as your sole identifier.