As a Single Pole Single Throw (SPST) switch

Using a switch with different open/close setpoints can lead to unsafe operation or premature component failure

The 1/2" ODF sweat connections ensure a leak-free

and cotter pin for a complete rebuild of the stem seal

Engineered for reliability in low-pressure gas systems

Lennox 87H90 Limit Switch As a Single Pole SingleThe Lennox 87H90 Limit Switch is a critical OEM furnace replacement part engineered for precise thermal regulation within high performance heating systems. This primary limit control features a 1. 75 inch insertion length and operates on an automatic reset logic, making it essential for maintaining safe internal plenum temperatures. As a veteran technician knows, this SPST (Single Pole Single Throw) safety device is designed to open on rise at 190F