Stainless Steel Automatic Flow Switch 1/2 Inch Electric Water Flow Control Switch for HVAC - China Paddle Water Flow Switch, Water Flow Switch | Made-in-China.com
Water Flow Switch HFS-15 SPDT Cooling System Paddle Water Flow Control Switch with 1/2-Inch Thread Connection, 220VAC 15A: Amazon.com: Industrial & Scientific
High Pressure Flow Control Switch - Confidently Control Fluid Flow