McDonnell & Miller 304300 Snap Switch Els PW 17895 the Lennox 42J03 ensures that

the Lennox 42J03 ensures that your heating equipment operates within manufacturer-specified safety parameters

Accuracy Preservation: Minimizes direct solar gain and foreign matter accumulation to ensure precise ambient temperature sensing

Can I use this for liquid line applications

Installation Versatility: The non-positional design and snap-off bracket allow for seamless integration in any orientation

extending the operational life of the HVAC control transformer

McDonnell & Miller 304300 Snap Switch Els PW 17895 the Lennox 42J03 ensures thatThe McDonnell & Miller 304300, also identified as the FS1 17 Snap Switch Assembly, is the critical single pole, double throw (SPDT) replacement component designed for Series FS1, FS4 3D, FS5, FS6, and AFE 1 liquid flow switches. This industrial grade switch is engineered specifically for high sensitivity applications in hydronic heating and HVAC systems where detecting low or moderate flow rates is vital for system protection. As an OEM replacement