Xylem-McDonnell & Miller FS4-3J SPDT Flow Switch W/Internal Thread FS4-3 114610

The Xylem-McDonnell & Miller FS4-3J General Purpose Liquid Flow-Switch monitors flow in HVAC systems. This has a 1"BSPT connection and is operated with a Single Pole Double Throw mechanism to reliably control and protect by sensing the presence or absence the fluid flow. It is commonly used in cooling towers pumps and chillers to prevent damage to the system from low or no flow conditions. This improves system efficiency thereby reducing the risk of equipment failure and improving maintenance bills effectiveness and operational durability.