As a Single Pole Single Throw (SPST) switch

The delay ensures that if the system loses power or the thermostat cycles quickly

and cotter pin for a complete rebuild of the stem seal

The MARS 12838 Run Capacitor is a high-performance 50/5 MFD 370V dual run capacitor designed for continuous duty in residential and commercial HVACR 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