Firstco CP81-59 Fixed Orifice Piston 0.059 Inch

The Firstco CP81-59 is a fixed orifice piston metering device with a precision-bored 0.059 inch opening, designed for use in residential and light commercial HVAC systems. This replacement piston serves as a critical refrigeration component that controls refrigerant flow from the condenser to the evaporator coil.

Key Features:

• 0.059 inch (59 thousandths) precision orifice bore diameter
• Compatible with 2-ton R-22 and 2.5-ton R-410A systems
• Simple fixed orifice design for reliable, consistent operation
• Easily replaceable without extensive system modifications
• Genuine Firstco OEM replacement part

This piston-type metering device creates a controlled pressure drop as high-pressure liquid refrigerant passes through the small bore, allowing the refrigerant to expand and cool before entering the evaporator. The fixed orifice design provides dependable performance in systems with relatively stable operating conditions. In heat pump applications, the piston can slide within its housing to allow bypass flow when refrigerant direction reverses.

Application: The 0.059" bore size is typically specified for 2-ton capacity systems using R-22 refrigerant or 2.5-ton systems using R-410A refrigerant. Always verify the correct piston size with your equipment manufacturer's specifications to ensure proper system performance and charging characteristics.