Durable Construction: Built to withstand the high-temperature environment of the furnace cabinet without drifting from calibrated setpoints

remote-bulb immersion-type temperature control engineered for high-limit safety applications in hydronic boilers and storage tanks

the A99BB-200 is the direct functional replacement

Durable Construction: Features a robust 48 frame and thermal overload protection to handle the rigors of continuous duty HVAC cycles

Enhanced Durability: Heat and chemical-resistant rubber components are built to handle commercial backflow prevention stressors

Lennox 67K19 Relay 318973-401 Durable Construction: Built to withstandThe Lennox 67K19 Relay (part number 67K1901) is an essential OEM replacement component engineered for high reliability switching in residential and commercial HVAC systems. This 120V relay is typically configured for SPDT (Single Pole Double Throw) or SPST (Single Pole Single Throw) operation, depending on the specific furnace or air handler wiring requirements. Operating at 50 60 Hz, it provides precise control over high voltage circuits for