these two models are functionally and technically identical and can be used interchangeably in all applications

It features integrated drainage ports compatible with standard 3/4-inch NPT fittings

Designed for versatile field applications

for applications with extreme pulsation or mechanical vibration

Lochinvar & A.O. Smith 100170642 Temp Sensor Els PW 17895 these two models are functionallyThis Lochinvar & A. O. Smith 100170642 Temp Sensor is a critical OEM replacement part designed for high efficiency hydronic systems and commercial water heaters. As a direct successor to the TST30011, this flue temperature sensor (also cross referenced as 100170536 and TST20008) provides real time thermal monitoring of exhaust gases. When installed in Knight XL boilers or A. O. Smith power vented units, it communicates vital data to the control board