Description
The Xylem-McDonnell & Miller 349400 is a genuine OEM Black Y Assembly (Model Number SA159-17) designed as a direct replacement component for McDonnell & Miller low-water cutoff and pump control units, including the 42A, 47, 64A, and 42S-A series. This precision-engineered assembly ensures reliable, long-lasting performance and maintains the operational integrity of your boiler safety controls.
Product Overview
McDonnell & Miller, a trusted Xylem brand, has been a leading manufacturer of boiler controls and hydronic accessories for decades. The 349400 Black Y Assembly is a factory-specified service part engineered to exact tolerances, making it the ideal choice for technicians performing maintenance or repair on compatible low-water cutoff and pump controller models.
Compatible Models
- McDonnell & Miller Model 42A
- McDonnell & Miller Model 47
- McDonnell & Miller Model 64A
- McDonnell & Miller Model 42S-A
Key Features & Benefits
- Genuine OEM replacement part — ensures proper fit and function
- Black Y Assembly configuration (SA159-17) for precise compatibility
- Manufactured to Xylem-McDonnell & Miller quality standards
- Restores full operational performance of low-water cutoff controls
- Reduces downtime with a reliable, drop-in replacement solution
- Ideal for boiler service, maintenance, and repair applications
Application
This assembly is intended for use in hydronic and steam boiler systems where McDonnell & Miller 42A, 47, 64A, or 42S-A low-water cutoff or pump controllers are installed. Replacing worn or damaged Y assemblies with a genuine OEM part helps maintain boiler safety and system efficiency, protecting equipment and personnel from low-water conditions.
