Firstco CP81-46 Orifice Piston Fixed Refrigerant Metering Device .046"

The Firstco CP81-46 is an OEM fixed orifice piston metering device designed for use in First Company HVAC air handler and heat pump systems. With a precisely calibrated 0.046-inch orifice diameter, this piston controls the flow of refrigerant entering the evaporator coil, creating the pressure drop necessary for the refrigeration cycle to operate correctly.

The piston-style insert seats into the distributor or metering body of the refrigerant circuit, forming a fixed restriction in the liquid line or evaporator inlet assembly. During cooling operation, high-pressure refrigerant from the condenser is forced through the small calibrated orifice, dropping in pressure and temperature before entering the evaporator. The orifice size is matched to specific system capacity and refrigerant type, making it critical to install the correct part number for proper system performance.

Key Features:

• OEM First Company replacement orifice piston
• Calibrated 0.046-inch (46 mil) fixed orifice diameter
• Compatible with First Company HX-Series air handlers (e.g., 15HX)
• Functions as a fixed refrigerant metering device in the liquid line or evaporator inlet
• Genuine factory part ensuring proper refrigerant flow and system efficiency

The CP81-46 is a direct OEM replacement part. Always verify the correct orifice size for your specific unit model and refrigerant type before installation. Systems using a fixed orifice piston must be precisely charged, as the metering rate is not adjustable.