Weil McLain 511-624-521 Pressure Switch Els PW 17895 maintaining the HVAC safety control

maintaining the HVAC safety control integrity required for professional code compliance

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

Using these gaskets on different valve bodies may result in improper sealing and potential system failure

Weil McLain 511-624-521 Pressure Switch Els PW 17895 maintaining the HVAC safety controlThe 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