making it compatible with major OEM brands like Follett

This replacement regulator spring is color-coded violet for rapid identification during routine maintenance or HVAC pressure adjustment tasks

This unit features a high-precision 10K Ohm Type III thermistor sensing element

Check the stamping on your existing disc

Cleveland Controls DFS-221-227 Switch making it compatible with majorThe Cleveland Controls DFS 221 227 is a precision engineered airflow proving switch specifically designed for duct heaters, ovens, and energy management systems. This fixed set point air pressure switch is factory calibrated to operate on a pressure rise at 0. 05" 0. 02" w. c., making it a reliable solution for applications where a non adjustable, tamper proof sensing component is required. Built with a durable plated housing and a high performance