Common Questions What are the specific temperature set points

TEAO Enclosure: The totally enclosed air over design protects internal windings from dust and humidity

The Marley Engineered Products 4520-2018-003 Limit Switch is a critical safety component engineered for forced-air heating applications where precise thermal protection is non-negotiable

Simplified Maintenance: The unitized design allows for quick access to internal components without removing the entire valve from the line

McDonnell & Miller 339800 Arm Assembly Els PW 17895 Common Questions What are theThe McDonnell & Miller 339800 is a precision engineered SA25 5 Arm Assembly specifically designed for the 25A Series make up water feeders. As a veteran technician knows, maintaining the mechanical linkage between the float and the valve assembly is critical for ensuring accurate water level regulation in residential and commercial boiler systems. This replacement float arm serves as a direct OEM component for Series 25 A controls, restoring the