ERSIQI Float Switch,Water Level Sensor Vertical Float Switch for Ice Maker Sump Pump Bilge Pump Water Tank Aquarium, Limit Card can Vertical or Inverted Installation: Amazon.com: Industrial & Scientific
Square D 9036 Heavy-Duty Open Tank Float Switch, NEMA 1, Contacts Close on Rise, 1 NO - 1 NC Contact Configuration: Electronic Component Limit Switches: Amazon.com: Industrial & Scientific