The Xylem-McDonnell & Miller 339900 (Model SA25A-6) is a genuine OEM valve assembly and gasket kit designed as a service replacement for the McDonnell & Miller 25A Series low water cutoff and pump controllers. Engineered to OEM specifications, this assembly ensures a precise fit and reliable performance when servicing or rebuilding your 25A Series unit, restoring proper boiler protection and extending equipment service life.
Product Overview
The 25A Series is one of the most trusted low water cutoff controls in the hydronic heating industry. When routine maintenance or a system fault requires internal service, the 339900 valve assembly and gasket kit provides all the critical internal components needed to return the control to like-new operating condition — without the cost of full unit replacement.
Key Features
- Genuine Xylem-McDonnell & Miller OEM replacement part
- Designed specifically for the 25A Series low water cutoff and pump controllers
- Includes valve assembly and all necessary gaskets for a complete service rebuild
- Ensures proper sealing and valve operation after installation
- Helps maintain boiler safety and code compliance
- Simplifies field service — reduces downtime and replacement costs
Compatibility
- Compatible with McDonnell & Miller 25A Series low water cutoff controls
- Model Number: SA25A-6
- SKU: 339900
Application
Ideal for HVAC technicians and boiler service professionals performing routine maintenance or emergency repairs on steam and hot water boiler systems equipped with the McDonnell & Miller 25A Series low water cutoff. Using genuine OEM service parts ensures the control continues to meet its original safety and performance standards.
