this Apollo 18C series valve utilizes a silicone seat and a stainless steel spring for reliable reseating and long-term corrosion resistance

While commonly used on larger Ultra Gas 550 and 750 units

As a direct 68-24048-01 cross-reference

the resulting temperature spike triggers the switch to open the electrical circuit

moisture removal vs

Maxitrol TS244A Temperature Sensor Els PW 17895 this Apollo 18C series valveThe Maxitrol TS244A is a precision engineered wall mount space temperature sensor specifically designed for integration with Series 44 Selectra electronic gas flame modulation systems. Built for the rigors of industrial and commercial space heating, this electronic temperature sensor maintains a specialized sensing range of 40 80 degrees F (4 27 degrees C). As a veteran tech knows, compatibility is paramount: the TS244A must be paired with a