Description
The Xylem-McDonnell & Miller 339500 (Model SA21-6) is a genuine OEM valve assembly and gasket replacement kit designed specifically for the McDonnell & Miller 21 Series low water cutoff and pump controllers. Keeping your low water cutoff in proper working order is critical to boiler safety and system reliability — this factory-matched service part ensures a precise fit and restores full operational integrity to your 21 Series control.
Product Overview
The SA21-6 valve assembly and gasket set is engineered to match the exact specifications of the 21 Series low water cutoff, eliminating guesswork during maintenance or repair. Using genuine Xylem-McDonnell & Miller replacement parts helps maintain the performance standards and safety ratings of the original equipment.
Key Features
- Genuine OEM replacement valve assembly and gasket for McDonnell & Miller 21 Series low water cutoffs
- Model number SA21-6 — direct factory-matched fit for 21 Series controls
- Restores proper valve function and sealing integrity
- Supports safe, reliable boiler operation by maintaining low water cutoff performance
- Manufactured to Xylem-McDonnell & Miller quality standards
Compatibility
- Compatible with McDonnell & Miller 21 Series low water cutoff and pump controllers
- Designed for steam boiler hydronic heating system applications
Why Choose Genuine OEM Parts?
Using factory-authorized replacement components like the 339500 valve assembly and gasket ensures your low water cutoff continues to meet its original safety and performance specifications. Aftermarket alternatives may not provide the same fit, seal quality, or longevity. Trust Xylem-McDonnell & Miller genuine parts for critical boiler safety controls.
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