while the robust plastic fins resist chemical degradation from flue gas proximity

ensuring the sensing element is positioned accurately within the heat exchanger airflow to prevent thermal overloading

distinguishing it from other HALC or TOD series switches

Professional Reach: The 18-inch copper lead provides sufficient flexibility for routing away from the main burner path to prevent premature wear

Precision 210F thermal response provides accurate protection for high-efficiency gas furnaces

McDonnell & Miller P-4-SS Probe Rod Els PW 17895 while the robust plastic finsThe McDonnell & Miller P 4 SS Probe Rod (Part Number 179545) is a heavy duty, 48 inch 316 stainless steel probe rod engineered for precision liquid level sensing in demanding boiler environments. Designed as a critical boiler safety device, this probe features a specialized PTFE coating (Teflon) to prevent bridging and ensure accurate conductance signals, especially in systems prone to sediment or scale buildup. It serves as a direct replacement