Universal Replacement: Direct 1:1 replacement for the Honeywell ST9103A1028 electronic fan timer

299-inch inside diameter is specifically toleranced for thermal bulb responsiveness

atmospheric boilers

it is suitable for various steam and boiler processes

Lochinvar & A.O. Smith 100109721 Upper Probe 320735-701 Universal Replacement: Direct 1:1 replacementThe Lochinvar & A. O. Smith 100109721 Upper Probe is a critical OEM replacement part engineered for the inner control assembly of high efficiency commercial water heaters. As a high performance hot surface igniter, this 100109721 probe is essential for ensuring reliable ignition cycles and precise flame sensing in BTH Series units. Designed to meet exact factory specifications, it eliminates the common failure points associated with generic