Xylem-McDonnell & Miller 750B-C-4 Remote Mount Liquid Level Control, NEMA 4X, 4-Probe

The Xylem-McDonnell & Miller 750B-C-4 (Part Number 176317) is a cast iron body, remote mount liquid level control engineered for reliable boiler and hydronic system water level monitoring and protection. Designed for use with 4 probes, this unit features a NEMA 4X-rated enclosure for superior resistance to corrosion, dust, and water ingress — making it well-suited for demanding mechanical room environments.

The 750B-C-4 includes both sight glass tappings and gage cock tappings, allowing operators to visually verify water level directly at the unit while the electronic probe system provides accurate, low-maintenance level sensing. The remote mount configuration offers installation flexibility, enabling the control head to be positioned separately from the probe assembly for easier wiring access and serviceability.

Key Features

• Cast iron body construction for durability in boiler and hydronic applications
• Remote mount design for flexible installation and easy service access
• Compatible with 4 probes for multi-level liquid sensing and control
• NEMA 4X enclosure — resistant to corrosion, dust, and water ingress
• Sight glass tappings for direct visual water level verification
• Gage cock tappings for pressure/level testing and maintenance
• Part Number: 176317

Applications

• Steam and hot water boiler water level control and protection
• Hydronic heating systems requiring remote-mounted level monitoring
• Industrial and commercial boiler rooms with corrosive or wet environments
• Multi-probe level sensing configurations requiring NEMA 4X protection

Product Specifications

• Body Material: Cast Iron
• Mount Type: Remote Mount
• Number of Probes: 4
• Enclosure Rating: NEMA 4X
• Tappings: Sight Glass and Gage Cock
• Brand: Xylem-McDonnell & Miller
• Part Number: 176317
• SKU: 750B-C-4