The 51749 kit is primarily designed for Reznor unit heaters equipped with specific Honeywell single-stage gas valves

the 3/4" NPT threaded connection and 4-3/4" copper float ensure long-term reliability in commercial and industrial steam boiler applications where accurate water inventory is critical for pump protection and system stability

With a 300 PSI max inlet pressure and a 180F maximum temperature rating

For sidewall or horizontal termination

The F93B-1 maintains the proper air cushion by bleeding off air that accumulates above the water level

McDonnell & Miller FS7-4SW Snap Switch Els PW 17895 The 51749 kit is primarilyThe McDonnell & Miller FS7 4SW is a heavy duty, industrial liquid flow switch engineered for high pressure applications requiring precise flow monitoring. Featuring a 1 1 4" NPT connection and a 316 stainless steel body, this unit is rated for line pressures up to 1000 PSI (70 kg cm). The integrated single pole double throw (SPDT) snap switch provides reliable signaling for starting or stopping motors, burners, or alarms based on flow velocity. For