Flow switches with PVC pipe section/lastic version with PVC shielded cable
Flow Switches – PVL
Flow Switches, Meters & Indicators – PVL
Aqualarm Flow Switch | 1 ½" PVC Slip Connection
Fafeicy YF-DN40 Water Flow Hall Sensor, 5-150L/min Water Flow Meter Flowmeter Counter, Water Flow Switch, Magnetic Water Sensor Switch with G1.5in Male Thread Interface : Amazon.co.uk: Business, Industry & Science
Everything You Need To Know About Flow Switches | RS
Reed flow switch - 2600 Series - Clark - for liquids / for air / PVC