The RBI Boiler 14-0201 Flow Switch is a monitoring component designed to detect fluid circulation within compatible boiler and hydronic heating systems. It works by sensing water flow through the piping and signaling the control system when circulation meets the required operating conditions. This flow switch is used in compatible RBI boilers and related HVAC heating equipment to supp... https://www.partshnc.com/14-0201-rbi-boiler-flow-switch