Operating on a normally closed circuit

this 250-degree sensor ensures precise system safety and heat management

Built for long-term serviceability

This Johnson Controls A99 series sensor is fully compatible with A421 electronic temperature controls

With a standard 1/2-inch bore

Auburn E9-251 BOOT-PK Boot Els PW 17895 Operating on a normally closedThe Auburn E9 251 BOOT PK is a high performance angle silicone boot designed specifically for industrial ignition systems and electrode protection. As a 10 pack bundle, this E9 251 BOOT PK serves as the direct replacement for the standard E9 251, providing superior electrical insulation and moisture resistance for HVACR and furnace applications. Engineered from durable high temperature silicone, these boots maintain flexibility and integrity under