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This pink valve cartridge is specifically engineered for Sporlan BQ series valve bodies
50" WC switch to fail to close
Thermal Protection: Integrated automatic reset thermal overload safeguards the motor against voltage fluctuations and excessive heat
provided the base T-4000 unit is selected for the specific control action required
Lochinvar & A.O. Smith 100109721 Upper Probe 321142-301 This pink valve cartridge isThe 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