McDonnell & Miller 149400 67 Low Water Cut-Off with Quick Hookup

Original price was: $589.73.Current price is: $443.61.

11 in stock

SKU: 38309 Category:


The McDonnell & Miller 149400 67 Low Water Cut-Off with Quick Hookup is a crucial safety device for steam boilers, protecting against the dangers of low water conditions. Here’s a quick breakdown of its key features and benefits:


  • Automatically shuts down the boiler burner if the water level falls below a safe threshold, preventing overheating 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 120-volt switches: One for low water cut-off (boiler shutdown) and one for alarm or electric water feeder (optional).
  • Maximum pressure of 20 psi: Suitable for residential and commercial low-pressure steam boiler applications.

Quick Hookup Feature:

  • Connects directly into gauge glass tappings (1/2″ NPT): Allows for fast and easy installation without complex piping modifications.
  • Minimizes downtime and saves labor costs: Quick and straightforward setup compared to traditional installations.

Additional Features:

  • Lever-operated blow down valve: Facilitates draining of the boiler for maintenance or repairs.
  • Adjustable BX outlet: Adapts to various boiler configurations and installation requirements.
  • Large float chamber: Ensures accurate and reliable water level detection.


  • Enhanced safety: Protects your boiler from low water hazards and potential explosions.
  • Reliable performance: Proven design and robust construction ensure years of dependable service.
  • Ease of installation: Quick hookup feature simplifies setup and minimizes downtime.
  • Versatility: Adapts to different boiler configurations and pressure ratings.
  • Peace of mind: Provides continuous monitoring and automatic response to water level changes.

Things to consider:

  • Compatibility: Ensure the model matches your boiler’s pressure rating and installation requirements.
  • Maintenance: Regular inspection and testing are necessary to ensure the LWCO is working correctly.

Overall, the McDonnell & Miller 149400 67 Low Water Cut-Off with Quick Hookup is a valuable safety device for your steam boiler. Its reliable performance, ease of installation, and additional features make it a popular choice for protecting your boiler and ensuring safe operation.

Additional information

Weight 11.34 lbs


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