Description
Xylem-McDonnell & Miller 351800 Upper Quick Hook-Up — Model SA259-24
The Xylem-McDonnell & Miller 351800 is an Upper Quick Hook-Up assembly designed specifically for use with McDonnell & Miller 42A, 47, and 42S-A Series low water cutoff and pump control devices. Engineered to simplify installation and ensure a reliable, secure connection, this hook-up fitting is the factory-specified replacement and retrofit component for these popular boiler control series.
McDonnell & Miller, a trusted Xylem brand, has long been the industry standard in boiler protection and hydronic system controls. This upper quick hook-up maintains that legacy of quality, providing contractors and technicians with a straightforward, drop-in solution that minimizes installation time and reduces the potential for connection errors.
Key Features
- Factory-designed upper quick hook-up for fast, secure installation
- Compatible with McDonnell & Miller 42A, 47, and 42S-A Series controls
- Model Number: SA259-24
- SKU: 351800
- Manufactured by Xylem-McDonnell & Miller — a trusted name in boiler protection
- Designed for reliable, long-term performance in hydronic and steam boiler applications
Compatible Series
- McDonnell & Miller 42A Series
- McDonnell & Miller 47 Series
- McDonnell & Miller 42S-A Series
Application
This upper quick hook-up is ideal for use in residential and light commercial boiler installations where McDonnell & Miller 42A, 47, or 42S-A Series low water cutoffs are employed. It ensures a proper, leak-free upper connection point, supporting safe and efficient boiler operation. Whether performing a new installation or replacing a worn component, the 351800 delivers the fit and reliability you expect from Xylem-McDonnell & Miller.









