Description
The Xylem-McDonnell & Miller RS-4-BR-1 is a four-level remote sensor probe holder designed for use with McDonnell & Miller electronic water level control systems. Featuring a 2-1/2″ NPT tank connection, this probe holder mounts directly to a boiler or tank and provides four discrete sensing levels for accurate, reliable water level detection and control.
Product Overview
The RS-4-BR-1 probe holder is engineered for use with McDonnell & Miller remote sensor-based liquid level controls. It accommodates four sensing probes, enabling multi-point water level monitoring — ideal for low-water cutoff, pump control, and high-water alarm functions in steam and hot water boiler systems. The brass construction ensures durability and corrosion resistance in demanding hydronic and steam environments.
Key Features
- Four-level remote sensor probe holder for multi-point water level detection
- 2-1/2″ NPT tank connection for direct boiler or tank mounting
- Brass construction for superior corrosion resistance and long service life
- Compatible with McDonnell & Miller electronic liquid level control systems
- Supports low-water cutoff, pump alternation, and high-water alarm sensing
- Part Number: 179527
- SKU: RS-4-BR-1
Applications
- Steam boiler water level control and low-water cutoff
- Hot water boiler systems
- Commercial and industrial hydronic heating systems
- Tanks and vessels requiring multi-level liquid sensing
Why Choose McDonnell & Miller
McDonnell & Miller, an Xylem brand, has been a trusted name in boiler water level controls and low-water cutoff devices for over a century. The RS-4-BR-1 probe holder is built to the same exacting standards, ensuring reliable performance and compatibility with the broader McDonnell & Miller control ecosystem.







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