5 part ensures the oscillation and mechanical timing of the valve remain within narrow operational tolerances

Industrial Grade Durability: Constructed to resist oxidation and thermal stress in high-demand HVACR systems

Designed for multi-refrigerant compatibility

Can I use this tee with R410A systems

ensuring the burner circuit is interrupted if internal temperatures exceed safe operating parameters

Reznor 121275 Block 5 part ensures the oscillationThe Reznor 121275 Stack Flue Block is a high limit safety component engineered specifically as an Energy Cutout Device (ECO) for commercial and industrial gas fired heating units. Designed to monitor the integrity of the ventilation system, this blocked vent switch acts as a critical failsafe by measuring exhaust temperatures at the flue. If the sensor detects a restriction, backflow, or overheating condition where temperatures reach the 275F trip