The /U indicates "universal" or retail packaging

Direct Compatibility: Exact fit for 1/4-inch and 3/8-inch NPT solenoid valves used in HVACR controls

it communicates directly with the appliance's control board to adjust flow rates based on real-time demand

Direct OEM Replacement: Ensures a perfect seat against the inducer housing for York

What is the difference between a normally closed and normally open solenoid valve

Lennox 10U66 Pressure Switch 322838-752 The /U indicates "universal" orThe Lennox 10U66 Pressure Switch is a critical safety component designed for heavy duty HVACR applications, specifically engineered to monitor high side refrigerant pressures. This 670# M R Hi Pressure Switch acts as a fail safe mechanism, protecting the compressor and system piping from catastrophic failure caused by extreme pressure spikes. It features a specific actuation point of 640 PSI and is built with a manual reset (M R) configuration,