This specific mechanical component is a direct-fit solution for the upper valve of Series TC-4 Test-N-Check configurations

Rugged Aluminum Construction: Delivers long-term durability in ambient temperature ranges from -40° to 205°F

This assembly features a durable plastic housing

Upon loss of pneumatic pressure

Lennox 14T66 Pressure Switch Refrigerant This specific mechanical component isThe Lennox 14T66 Pressure Switch is a critical dual stage safety component engineered for 90% efficiency modulating gas furnaces. As a veteran technician knows, maintaining the correct pressure differential is non negotiable for safe combustion. This OEM Lennox replacement part is factory calibrated to operate within a specific water column range of 1. 00" to 0. 25" WC, ensuring the inducer motor pulls the required vacuum before the ignition sequence