McDonnell & Miller 193-G-1 Replacement Casting

The McDonnell & Miller 193-G-1 Replacement Casting is a critical structural component for maintaining the integrity of Series 193-G low water cut-offs and pump controllers. Engineered for steam boiler water level control, this heavy-duty casting serves as the secondary water column, featuring integral tappings specifically for 1-inch NPT equalizing pipes. Designed for high-pressure environments, it supports systems with a maximum operating pressure of 150 psi. As a genuine replacement part, it ensures exact alignment for the head mechanism and internal float assembly, maintaining the manual reset or automatic functionality of the original 193-G Series. Replacing a cracked or scaled casting is essential for preventing leaks and ensuring the magnetic repulsion mechanism operates without interference. Professionals rely on this DH79 cast iron housing to restore the precise horizontal and vertical sensing required for industrial boiler safety and pump cycling efficiency.

• Precise Compatibility: Direct-fit housing for McDonnell & Miller 193-G-1 units, ensuring seamless integration with existing 1-inch NPT steam and water equalizing lines.
• High-Pressure Durability: Rugged construction rated for 150 psi steam pressure, providing the structural density needed for commercial boiler environments.
• Integral Tappings: Includes factory-machined ports for gauge glass and tri-cock installations, streamlining the low water cut-off maintenance process.
• Reliable Level Sensing: Ensures the internal chamber dimensions remain consistent, preventing float hang-ups and maintaining accurate boiler pump controller signals.

Which boiler models use the 193-G-1 replacement casting?
This casting is specifically for the McDonnell & Miller Series 193-G water column style controllers. It is designed for installations requiring 1-inch NPT connections and is commonly found on large-capacity commercial steam boilers.

Can this casting be used on Series 194 or 94 controls?
No. While they appear similar, the 194 and 94 Series often utilize 1-1/4 inch NPT tappings or are rated for higher pressures (up to 250 psi). Always verify the 193-G-1 part number to ensure proper thread sizing and pressure rating.

When should the casting be replaced instead of just the head mechanism?
Replace the casting if you observe external pinhole leaks, hairline cracks in the iron, or if internal scaling is too severe to allow the float to travel freely. A clean, unobstructed 193-G-1 casting is vital for the safety of the low water fuel cut-off circuit.

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.