McDonnell & Miller 94-1 Replacement Casting

The McDonnell & Miller 94-1 Replacement Casting is a heavy-duty cast iron body engineered specifically for Series 94 low water cut-off and pump controller assemblies. This OEM replacement part is critical for restoring the structural integrity of steam boiler water columns when the original housing suffers from scaling, pitting, or internal erosion. Built to withstand a maximum pressure of 250 psi, this casting features 1-1/4" NPT equalizing piping tappings to ensure accurate water level sensing and seamless integration with the head mechanism and float assembly.

For contractors performing boiler control repair, the 94-1 provides a precision-machined fit that maintains the magnetic repulsion alignment required for reliable switch operation. By replacing only the damaged 94 Series casting, technicians can avoid the cost of a full system swap while ensuring the pump controller continues to manage water levels across high-capacity industrial applications. This component is compatible with standard 94-HD head mechanisms and is designed for straightforward installation into existing 10-bolt flange configurations.

• Industrial-Grade Durability: Rugged cast iron construction provides superior resistance to thermal stress and corrosion in high-pressure steam environments.
• Exact OEM Compatibility: Specifically designed for Series 94 units, ensuring all tappings for gauge glass and tri-cocks align perfectly.
• High Pressure Rating: Safely supports systems operating up to 250 PSI for commercial and industrial steaming capacities.
• Optimized Level Control: Restores the internal volume required for the float to actuate the low water cut-off sequence without mechanical interference.

Can this casting be used for Series 193 or 194 units?
The 94-1 is designed for the Series 94. While similar, always verify the specific tapping sizes and flange bolt patterns, as Series 194 components or alternate models like the 94-A may require different casting configurations.

Does this include the head gasket or mounting bolts?
This part number refers to the replacement casting body only. It is professional best practice to source a new 92-68 head gasket individually to ensure a pressure-tight seal during reassembly.

When should a casting be replaced instead of cleaned?
If the interior walls show significant thinning, "deep-vein" corrosion, or if the NPT threads for the equalizing pipes are stripped or cracked, a full replacement casting is mandatory to prevent catastrophic steam leaks.

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.