Lennox 34M74 Pressure Switch Els PW 17895 The Sporlan QC-1 features a

The Sporlan QC-1 features a replaceable design that allows for rapid field service without de-brazing the entire valve body from the liquid line

Using it with NG would cause improper combustion and safety hazards

It is engineered for heavy-duty performance in demanding furnace and air conditioning applications

When the limit switch fails or detects an overheat

Lennox 34M74 Pressure Switch Els PW 17895 The Sporlan QC-1 features aThe Lennox 34M74 Pressure Switch is a critical safety component engineered for precision monitoring of combustion air in residential and commercial HVAC systems. This OEM Lennox replacement part features a single pole, single throw (SPST) electrical configuration, meticulously calibrated to an actuation point of . 33" WC (inches water column). Designed with a standard 1 4" barb connection, it ensures a secure, leak proof interface with the inducer