McDonnell & Miller FS7-4WL Snap Switch Freon Simplified Maintenance: The push-on design

Simplified Maintenance: The push-on design with integrated piston-type seals prevents bypass and allows for rapid field replacement

Key Benefits: Balanced Port Design: Delivers consistent superheat and stable operation across a wide range of operating conditions and partial loads

Each thermal expansion valve part kit comes complete with the necessary capscrews for a secure fit to the valve body

Does the A30-183 have a manual 'Off' position

extending the service life of the hydronic zone valve motor

McDonnell & Miller FS7-4WL Snap Switch Freon Simplified Maintenance: The push-on designThe McDonnell & Miller FS7 4WL (Part Number 120301) is a heavy duty, industrial grade liquid flow switch engineered for high demand applications requiring precise flow monitoring. Featuring a 1 1 4" NPT connection and a robust SPDT snap switch, this unit is designed for integration into control circuits that signal alarms, start motors, or cycle pumps. The FS7 4WL is built for durability with an extended paddle arm and trimmable stainless steel