Description
The Xylem-McDonnell & Miller P-4-SS is a heavy-duty 48-inch probe rod engineered for precision water level sensing in boiler and hydronic heating systems. Constructed from 316 stainless steel and finished with a PTFE (polytetrafluoroethylene) coating, this probe rod delivers outstanding resistance to corrosion, scale buildup, and chemical attack — making it an ideal choice for demanding commercial and industrial boiler applications.
Key Features
- 48-inch overall probe rod length for deep-tank or tall-vessel installations
- 316 grade stainless steel construction for superior corrosion and heat resistance
- PTFE coating provides additional protection against scale, mineral deposits, and chemical exposure
- Designed for use with compatible McDonnell & Miller low-water cutoff and water feeder controls
- Ensures accurate, reliable water level detection to protect boiler equipment
- Part Number: 179545
Application
The P-4-SS probe rod is a direct replacement and upgrade component for McDonnell & Miller electrode-type low-water cutoff systems. It is well-suited for steam and hot water boilers in commercial, institutional, and light industrial environments where dependable water level control is critical to system safety and efficiency.
Product Specifications
- Brand: Xylem-McDonnell & Miller
- SKU: P-4-SS
- Part Number: 179545
- Probe Length: 48 inches
- Material: 316 Stainless Steel
- Coating: PTFE (Polytetrafluoroethylene)









