What is the purpose of the 1 1/2" shank

As an OEM replacement relay

ensure your specific project requires "Cleaned and Bagged" (Oxy/Med) certification before use in medical gas systems

This high pressure cut-out switch features a SPST (Single Pole Single Throw) normally closed contact configuration

What is the benefit of the 2

Lennox 88W59 Pressure Switch What is the purpose ofThe Lennox 88W59 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high efficiency furnaces and air handlers. As a Single Pole Single Throw (SPST) switch, it is engineered to actuate at 0. 15" W. C. and reset at 0. 34" W. C., effectively preventing operation during unsafe draft conditions or venting obstructions. This genuine HVAC OEM part is the direct performance 103094 01 cross reference for the legacy