Lennox 11U66 Pressure Switch 320074-702 These HVAC zone valve fittings

These HVAC zone valve fittings are essential for contractors performing maintenance or new installations where a mechanical flare-to-sweat transition is required to maintain system integrity

including MP953A

this OEM-spec O-ring ensures dimensional accuracy and thermal stability

This enclosed motor design features sealed ball bearings and is thermally protected to handle the high-ambient loads typical of York

74 Cv rating and an equal percentage flow characteristic on the controlled port

Lennox 11U66 Pressure Switch 320074-702 These HVAC zone valve fittingsThe Lennox 11U66 Pressure Switch is a critical safety component designed for precise draft monitoring in high efficiency gas furnaces and HVAC systems. As a genuine OEM replacement, this 0. 55" WC pressure switch is factory calibrated to actuate at 0. 55 inches of water column, ensuring the inducer motor is creating sufficient static pressure before the ignition sequence begins. Built by Cleveland Controls (MPN: 11U66 or 104371 03), this single pole