McDonnell & Miller 67-G 149600 Low Water Cut-Off

Original price was: $519.87.Current price is: $447.63.

2 in stock

SKU: 38310 Category:


The McDonnell & Miller 67-G 149600 Low Water Cut-Off is a specific model within the popular 67 series, designed for steam or hot water boilers with millivolt service. Here’s a breakdown of its key features:


  • Automatic safety device: Shuts down the boiler burner if the water level falls below a safe threshold, preventing damage and potential explosions.

Operating Principle:

  • Float-activated: A float inside the boiler rises and falls with the water level, triggering a switch when it drops too low.
  • Dual mercury switches: One for low water cut-off (boiler shutdown) and the other for alarm or feeder control (optional).
  • Millivolt service: Compatible with low-voltage systems typically found in smaller boilers.


  • Quick hook-up fittings: Simplify installation for gauge glass tappings (1/2″ NPT).
  • Lever-operated blow down valve: Easy to drain sediment and maintain the boiler.
  • Adjustable BX outlet: Adapts to various installation configurations.
  • Large float chamber: Ensures accurate water level sensing.
  • Maximum steam pressure: 20 psi.


  • Enhanced safety: Protects your boiler from low water hazards.
  • Reliable operation: Proven design and durable construction.
  • Ease of installation and maintenance: Quick connect fittings and accessible blow down valve.
  • Versatility: Suitable for steam and hot water boilers with millivolt service.

Things to consider:

  • Compatibility: Ensure the 67-G 149600 matches your boiler type, pressure rating, and electrical requirements.
  • Installation: Proper installation by a qualified technician is crucial for safety and optimal performance.
  • Maintenance: Regular inspection and testing are recommended to ensure the Low Water Cut-Off is functioning correctly.

Overall, the McDonnell & Miller 67-G 149600 Low Water Cut-Off is a reliable and effective safety device for millivolt steam and hot water boilers. Its combination of features, ease of use, and robust construction makes it a popular choice for protecting your boiler and ensuring safe operation.

Additional information

Weight 11.29 lbs


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.