The unit features an integrated test interface that allows technicians to simulate a smoke condition

Measurement for B-section belts is typically taken as use-length or outside circumference

This model features 1 3/8" ODF (Outside Diameter Female) copper connections

or shortening the tube will cause the thermostat to fail immediately

Auburn E5-399N-2PK Electrode 323613-751 The unit features an integratedThe Auburn E5 399N 2PK Electrode is a high performance Mid Continent Electrode designed for reliable industrial ignition and flame sensing. This essential HVACR replacement part is the direct successor to the original E5 399N model, now conveniently offered as a Package of 2 pcs to ensure you have a backup on hand. Engineered by Auburn Ignition Products, these boiler electrodes feature a 3 9 16" length with a 1" insulator, providing precise fitment