Description
Product Overview
The Xylem-McDonnell & Miller 340400 Diaphragm Seal Assembly (Model SA27T-75) is a genuine OEM replacement part engineered specifically for the McDonnell & Miller 25A Series low water cutoff and pump controls. Designed to maintain the integrity of the sensing chamber, this diaphragm seal assembly ensures accurate water level detection and reliable boiler protection — keeping your hydronic heating system operating safely and efficiently.
Key Features
- Genuine Xylem-McDonnell & Miller OEM replacement component
- Engineered for direct compatibility with the 25A Series low water cutoff controls
- Diaphragm seal design isolates the sensing mechanism from boiler water and steam pressure
- Helps maintain accurate float-free water level sensing performance
- Supports reliable low water cutoff operation to protect boiler equipment
- Durable construction for long service life in demanding hydronic and steam applications
- Model Number: SA27T-75
- SKU: 340400
Application
This diaphragm seal assembly is the correct replacement part for technicians servicing or rebuilding McDonnell & Miller 25A Series low water cutoff controls. The 25A Series is widely used in residential and light commercial steam and hot water boiler systems. Replacing a worn or damaged diaphragm seal restores proper sensing function and helps prevent costly boiler damage caused by low water conditions.
Why Choose OEM Parts?
Using genuine Xylem-McDonnell & Miller replacement components ensures proper fit, function, and long-term reliability. OEM parts are manufactured to the same specifications as the original equipment, reducing the risk of premature failure and maintaining the safety performance your boiler system depends on.
