the 664349R provides seamless backward compatibility and enhanced mechanical reliability

Equipment Protection: Built-in 5-minute time delay prevents rapid compressor cycling to ensure long-term system health

Engineered with a robust bronze body (ASTM B584)

For techs performing a field conversion or replacing a clogged gas jet

Operating on a 24V AC coil

Advanced Distributor Products 176799953 Piston 321142-301 the 664349R provides seamless backwardThe ADP 176799953 is a precision engineered #53 ton piston designed for reliable refrigerant metering in residential HVAC systems. Also known as a fixed orifice metering device, this genuine ADP replacement part is critical for maintaining the correct pressure drop between the high and low sides of the cooling circuit. Specifically sized for 1. 5 ton R22 or 2 ton R410A evaporator coils, it ensures the optimal flow of refrigerant to maximize heat