McDonnell & Miller FS4-3DS Switch R-410A The 7/16" hex tool is

The 7/16" hex tool is a common specification for many Johnson Controls linkage sets

Wide Temperature Range: The 40-80°F setpoint range is optimized for industrial comfort and process heating requirements

this unit is specifically designed for Burnham boiler wiring harnesses

engineered to handle the specific amperage and temperature cycling requirements of the original equipment

McDonnell & Miller FS4-3DS Switch R-410A The 7/16" hex tool isAs an HVACR veteran, you know that missing flow in a hydronic system or process loop is a recipe for catastrophic equipment failure. The McDonnell & Miller FS4 3DS (Part Number 114642) is the heavy duty solution when you need reliable liquid flow switch performance in aggressive environments. Built with a stainless steel body and wetted parts, this unit is specifically designed to handle corrosive fluids that would degrade standard brass models. It