and 42S-A low water cut-offs and pump controllers

This ensures high-accuracy gas flow modulation for makeup air units and space heating systems

ensure your 24V transformer capacity matches the inrush and holding current requirements of this OEM Trane part to maintain peak efficiency

Is hardware included with the S1-026-17579-900

Williams P043801 Thermocouple R-22 and 42S-A low water cut-offsThe Williams P043801 Thermocouple is a mission critical safety component engineered for Williams Comfort Products vented hearth heaters and furnace systems. This 23 inch OEM replacement thermocouple is designed to provide precise millivoltage output to the gas valve, ensuring that the main burner only receives fuel when a stable pilot flame is detected. For technicians working on Williams wall furnaces or room heaters, this part is a direct match for