McDonnell & Miller AP-3-SS-J Probe Rod as higher elevations often require

as higher elevations often require different WC thresholds to account for thinner air density

also recognized in the field as the QC-6

As a direct replacement for 5H71764-2

High Reliability: Features a durable SPST switch mechanism that withstands the cycling demands of modern high-efficiency heating equipment

McDonnell & Miller AP-3-SS-J Probe Rod as higher elevations often requireThe McDonnell & Miller AP 3 SS J (Part Number 176231) is a heavy duty, 39 inch (991mm) stainless steel probe rod designed for high precision liquid level sensing in commercial and industrial boiler applications. Engineered for compatibility with conductance type level controls, this ambient probe provides the critical conductive path required for low water cut off (LWCO) and pump control sequencing. In the field, its 300 series stainless steel