Xylem-McDonnell & Miller 343500 Bellows Assembly for 64 Series LWCO SA64-2

Description

The Xylem-McDonnell & Miller 343500 is an OEM replacement Bellows Assembly designed specifically for the McDonnell & Miller 64 Series Low Water Cut Off (LWCO), compatible with Model SA64-2. This genuine factory replacement component ensures your low water cut off continues to perform its critical safety function — protecting boilers from dangerous low-water conditions that can cause overheating, damage, or failure.

Product Overview

The bellows assembly is a key internal sensing element within the 64 Series LWCO. As water levels fluctuate inside the boiler, the bellows responds to changes in water and steam pressure, triggering the cut off switch when water drops below a safe operating level. Replacing a worn or faulty bellows assembly restores the precision and reliability of your low water cut off without the cost of replacing the entire unit.

Key Features

• OEM replacement bellows assembly for McDonnell & Miller 64 Series Low Water Cut Off
• Compatible with Model SA64-2
• Restores accurate water-level sensing and boiler safety protection
• Genuine Xylem-McDonnell & Miller quality construction
• Direct drop-in replacement for simplified installation
• Helps extend the service life of your existing 64 Series LWCO

Application

• Designed for use with McDonnell & Miller 64 Series Low Water Cut Off controls
• Suitable for steam boiler low water protection applications
• Ideal for service technicians performing preventive maintenance or repair on existing LWCO units

Why Replace the Bellows Assembly?

Over time, bellows assemblies can fatigue, corrode, or lose their sensitivity due to the harsh conditions inside a steam boiler system. A degraded bellows can result in inaccurate water level detection, potentially allowing a boiler to operate under unsafe low-water conditions. Replacing the bellows assembly with a genuine McDonnell & Miller part ensures continued code-compliant, reliable boiler protection.

Brand

McDonnell & Miller, a brand of Xylem, has been a trusted name in boiler safety controls and hydronic system components for over a century. Their low water cut offs and replacement parts are widely specified by engineers and relied upon by service professionals across North America.