McDonnell & Miller 63-HD Head Mechanism 142600 for 63

Original price was: $976.93.Current price is: $573.68.

1 in stock

SKU: 38281 Category:


The McDonnell & Miller 63-HD Head Mechanism is a crucial component for any boiler system utilizing the McDonnell & Miller Series 63 LWCOs (Low Water Cut-Offs). Here’s a breakdown of its key features and functions:


  • Replaces the head portion of a Series 63 LWCO, allowing for quick and easy service without disrupting piping or the boiler itself.
  • Houses the vital elements of the LWCO, including the float chamber, mercury switch, and external connections.


  • Simplified maintenance: Enables replacing the LWCO head without disconnecting pipes or draining the boiler, minimizing downtime and labor costs.
  • Reduced installation time: Can be quickly swapped out compared to replacing the entire LWCO unit, saving time during installation or repairs.
  • Versatility: Compatible with various models within the Series 63 LWCO range, offering flexibility for different boiler systems.
  • Durable construction: Built with high-quality materials for long-lasting performance and reliable operation.

Things to consider:

  • Compatibility: Ensure the 63-HD Head Mechanism matches your specific Series 63 LWCO model and pressure rating.
  • Installation: While potentially possible for DIYers with technical expertise, consulting a qualified boiler technician is recommended for safe and proper installation.
  • Limited functionality: Only replaces the head portion, requiring the existing LWCO body and other components to be functional.

Overall, the McDonnell & Miller 63-HD Head Mechanism is a valuable tool for simplifying maintenance and repairs on Series 63 LWCOs. Its ease of use, reduced downtime, and compatibility with various models make it a popular choice for boiler owners and technicians.

Additional information

Weight 30 lbs


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