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Automatic Float Switch
Float switch - Wikipedia
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Attwood 4202-7 Float Switch, For Bilge Pump, 12- and 24-V CE rated, 36-Inch Wire, 4 Inches L x 3 7/8 Inches W x 1 3/8 Inches H - Walmart.com
Attwood Automatic Float Switch 4202-7 - The Home Depot
Float Switch 220v Water Level Automatic Pump Control Sensor Plastic Ball Valve For Tower Tank Liquid Fluid Wire Length 2m China - Switches - AliExpress
Automatic Water Pump On Off by Float Switch - YouTube
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M15-3 220V Plastic Water Tank Flow Switch Float Level Control Switch Automatic Float Switch for Sump Water Pump Water Level Sensor - China Electrical Switch and Switch
Allen-Bradley, 840-A4, 840 Automatic Float Switch, Style A - Industrial Switch, Low Operating Force, Convertable for Tank or Sump Operation, Type 4 Fiberglass Polyester Enclosure, Standard contacts | State Electric