McDonnell & Miller 304400 Cover As a genuine OEM York

As a genuine OEM York replacement part

allowing it to handle line voltage fluctuations and inductive spikes better than a standard 370V unit

This high-limit safety switch is the direct professional solution for maintaining system integrity and meeting strict HVAC safety control specifications without risk of early failure from poor calibration

Universal Voltage Compatibility: Operates across a wide 18-240 VAC range

For contractors dealing with frequent water heater or boiler service calls

McDonnell & Miller 304400 Cover As a genuine OEM YorkThe McDonnell & Miller 304400 is a genuine replacement flow switch cover (Model FS4 3COV) engineered specifically for Xylem FS4 3 liquid flow switches and the AF 1, AF 2, and AF 3 airflow switch series. In demanding commercial boiler and process piping environments, maintaining the integrity of the switch housing is critical for protecting the single pole, double throw (SPDT) snap switch and internal sensitivity adjustments from dust, moisture, and