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Universal Compatibility: Validated for use across a wide range of Lochinvar Knight boiler parts
this OEM-spec O-ring ensures dimensional accuracy and thermal stability
including MP953A
ensuring more energy is transferred to the heat exchanger
Lennox 11U66 Pressure Switch 320074-702 Universal Compatibility: Validated for useThe 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
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