This replacement flue gasket provides a precision fit that eliminates "whistling" air leaks and prevents energy loss through the exhaust stream

the resistance curve must match the OEM specs exactly to prevent control board errors or inefficient cycling

When carbon buildup or oxidation occurs on the probe

ensuring stable performance under continuous duty cycles

McDonnell & Miller 157S-RBP-MD Pump Controller 30067439-890 This replacement flue gasket providesThe McDonnell & Miller 157S RBP MD Pump Controller (Part Number 176503) is a heavy duty, float operated combination low water cut off and pump controller designed for commercial and industrial steam boilers. Engineered with an integral water column and monel bellows for superior corrosion resistance, this unit provides precise level management at operating pressures up to 150 psi. This specific model features maximum differential operation, which is