McDonnell & Miller 304400 Cover Key Benefits: OEM Compatibility: Genuine

Key Benefits: OEM Compatibility: Genuine Source1 part designed as a direct drop-in for York S1-025-29041-003

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

the S1-025-29041-711 should show 0 ohms (closed)

For contractors dealing with frequent water heater or boiler service calls

McDonnell & Miller 304400 Cover Key Benefits: OEM Compatibility: GenuineThe 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