Float Switch Kit for Dosing Container - Bulk Reef Supply
Shopcorp Water Level Meter Sensor Float Switch, Dual Function Operation 9.8 ft - ContactorDepot.com
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 (20 Ft Cable) - Amazon.com