McDonnell & Miller 157S-MD Pump Controller Els PW 29614 This boiler observation port assembly

This boiler observation port assembly allows technicians to perform critical visual inspections of the combustion chamber and flame pattern without compromising the pressure vessel's integrity or thermal seal

Simple Installation: Standard footprint and clear terminal markings allow for a fast "wire-for-wire" swap

Complete Replacement Assembly: Includes a factory-spec Norton 271Y igniter

operating with a 25 VAC control voltage

The Reznor 204327 SPDT Pressure Switch is a critical safety control designed for precise combustion air pressure monitoring in commercial and industrial gas-fired unit heaters

McDonnell & Miller 157S-MD Pump Controller Els PW 29614 This boiler observation port assemblySecure high performance water level management with the McDonnell & Miller 157S MD Pump Controller (Part Number 175412), a heavy duty combination low water cut off and pump controller designed for industrial and commercial steam boilers. Engineered for maximum differential operation, this model is built to prevent nuisance burner shutdowns caused by volatile, fluctuating water lines, making it an essential component for high demand boiler water level