Light Duty Avocado Float Switch - Double Pole Single Throw - Wide Angle - Skived Cord Ends - 20 Foot
Alt-tech Electrical | Mercury Bulb Float Switch, Water Tank Float Controller
Sludge Boss Septic Float Switch, Heavy-Duty Sewage Pump Switch for Viscous Liquids and Suspended Solids in Wastewater, Mercury-Free Self-Orienting Tank Float for Septic Pumps to 1/2 HP (33 Ft Cable) - Amazon.com
LITTLE MERCURY MC (Patented) - Matic
High Temperature Float Switch Hot Water Tank Water Level Switch Mercury Float Switch Water Level Control - Tool Parts - AliExpress
Mechanically Actuated Water Level Detection Float Ball Switch with Mercury Switch | Technovation-technological innovation and advanced industrial control technologies