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The 5500-135M is the direct replacement for 5500-135
this replacement boiler gasket prevents flue gas leakage and maintains the thermal integrity of the heat exchanger
and 9MPT100 models
The KH-AFB is optimized for 3/4" shafts
Common Questions: How many microamps should a York flame sensor produce
Weil McLain 511-624-521 Pressure Switch Els PW 17895 The 5500-135M is the directThe Weil McLain 511 624 521 Pressure Switch is a critical safety component designed for precise differential pressure sensing in high efficiency Weil McLain boilers. This SPST (Single Pole Single Throw) air pressure switch is factory calibrated to a 1. 25" W. C. (Water Column) set point, ensuring the vent blower is maintaining adequate airflow before allowing the ignition sequence to proceed. It features dual 1 4" barb connections for secure pneumatic
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