McDonnell & Miller 150-1 Replacement Casting

The McDonnell & Miller 150-1 Replacement Casting is a critical structural component engineered specifically for 150 Series and 158 Series combination low water cut-offs and pump controllers. This heavy-duty float chamber housing is designed to maintain the mechanical integrity of commercial steam boiler controls, providing a precise fit for both Series 150S and high-temperature snap-switch mechanisms. Constructed from durable materials to withstand high operating pressures up to 150 psi, this replacement boiler part allows technicians to restore the main body of the control without replacing the entire head mechanism or electrical components.

When performing a boiler control repair, the 150-1 casting ensures proper alignment for the float and rod assembly, facilitating accurate water level sensing. It is compatible with units utilizing 1-inch NPT equalizing pipe connections. By replacing a cracked or corroded housing with this OEM-spec casting, contractors can ensure leak-free performance and extend the service life of existing McDonnell & Miller liquid level controls in industrial and commercial hydronic systems.

• Direct Compatibility: Precision-engineered for McDonnell & Miller 150 and 158 Series bodies.
• High Pressure Rating: Safely handles steam boiler applications up to 150 psi (10.5 kg/cm²).
• Rugged Durability: Industrial-grade construction resists the thermal stresses of continuous low water cut-off operation.
• Service Efficiency: Allows for total housing restoration without the cost of a full unit replacement.

Is the 150-1 casting compatible with both the 150S and the older 150 models?
Yes, the 150-1 replacement casting is designed to support the Series 150, 150S, and 158 models, accommodating the standard head mechanisms for these series.

Does this casting include the head gasket or mounting bolts?
This part number typically refers to the casting body only. It is recommended to source a new head gasket (such as the CO-12) and check the integrity of mounting bolts when reinstalling the head mechanism.

Can this housing be used for both pump control and low water cut-off configurations?
The casting serves as the secondary containment and float chamber for the control; it supports the internal hardware required for both pump sequencing and burner shutdown functions.

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.