Watkins Flow Switch, Hotsprings/Tiger River 3/4"Barb X 3/4" Barb. This flow switch is located in the heater interlock relay coil circuit. When the switch is closed, voltage is transferred to the heater interlock coil when the control thermostat calls for heat.
This part can be found on:
Troubleshooting the common causes of flow switch ripping or failing are dirty or clogged filter, clogged intake, low water level, airlock in the filter cannister and worn out flow switch Average lifespan 10-12 years)