the HD44AQ266 features a 1/2-inch shaft diameter and utilizes ball bearings for increased durability and reduced vibration

This is the transition assembly itself

ensuring no bypass or leakage during testing

This is a negative pressure switch

the 20261701S is the service part number

Lennox 60M52 Solenoid Valve R-22 the HD44AQ266 features a 1/2-inchThe Lennox 60M52 Solenoid Valve is a critical flow control component engineered specifically for high pressure R410A refrigerant applications. This 3 8 inch solenoid valve features 3 8" ODF solder connections and a 3 16" internal port, facilitating precise liquid or suction line regulation. Designed for compatibility with high performance Lennox condensers and heat pumps, this HVAC solenoid valve operates as a "less coil" assembly, allowing