The unit is equipped with an integral vent limiting orifice

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

and industrial applications requiring precise and adjustable time-delay functions

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

McDonnell & Miller P-4-SS Probe Rod Els PW 17895 The unit is equipped withThe 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