This furnace pressure switch is constructed with durable housing and corrosion-resistant terminals to withstand the thermal cycling and moisture typical of condensing furnace environments

What is the difference between the K19AT-48 and K19AT-48H

Whether you are servicing a pressure reducing valve or a large-scale vacuum breaker

but it is available individually for targeted seal maintenance

Key Benefits Universal Compatibility: Specifically designed for McDonnell & Miller Series 21

Reznor 50418 Limit Switch This furnace pressure switch isThe Reznor 50418 Limit Switch is a critical OEM safety component engineered for Reznor HVAC equipment, specifically compatible with models like the UA100. This 125 145F auto limit switch functions as a high limit safety cut off, monitoring internal heat exchanger temperatures to prevent hazardous overheating. When the temperature exceeds the factory calibrated 145F threshold, the switch opens the electrical circuit to the gas valve, immediately