McDonnell & Miller 347600 Float, Rod, and Gaskets

The McDonnell & Miller 347600 Float, Rod, and Gaskets Kit (Model SA150-11) is a critical OEM replacement assembly engineered for the Series 150 and 150S boiler water level controls. Professional technicians understand that maintaining low water cut-off integrity is non-negotiable for system safety. This kit provides the necessary float and rod assembly to ensure precise buoyancy and mechanical actuation within the float chamber. Because steam boiler controls operate in high-pressure, high-heat environments, replacing degraded floats and gaskets prevents false readings and potential dry-fire conditions. This kit is compatible with McDonnell & Miller 150S models used in both primary and secondary pump control applications. By utilizing genuine McDonnell & Miller parts, you preserve the original UL and CSA listings of the control unit, ensuring the float rod and head gaskets provide a pressure-tight seal and reliable switching performance in commercial and industrial steam boiler systems.

Technical Benefits:

• Precise Level Sensing: Optimized float buoyancy ensures accurate boiler water level control and pump activation.
• OEM Component Matching: The SA150-11 kit eliminates compatibility issues with tolerances found in aftermarket parts.
• Complete Sealing: High-performance gaskets withstand thermal cycling to prevent steam leaks at the head flange.
• Direct Fit: Designed for rapid installation in Series 150 and 150S low water cut-offs to minimize system downtime.

Common Questions:

When should the SA150-11 float and rod be replaced?
Technicians should inspect the float during annual blow-down maintenance. If the float shows signs of collapse, pitting, or if the rod has significant scale buildup that impacts travel, a full replacement is necessary to ensure the low water cut-off functions correctly.

Is this kit compatible with both the original 150 and the newer 150S series?
Yes, the McDonnell & Miller 347600 is designed as a universal replacement for the internal float and gasket components across both the classic 150 series and the updated 150S series mechanical controls.

Will this kit fix a leaking boiler control?
If the leak is originating from the head gasket or the mounting flange of the 150 series control, the included gaskets in this kit will resolve the issue, provided the casting itself is not cracked or severely corroded.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.