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
SJE-RHOMBUS 1001817 SJE-Rhombus 15JSD1WP - Junior Super Single® Mercury-Activated Pump Switch 120V 13A Pump Down w/ 15' Cord+Plug
Float 15' SJE Pump Switch - Clearstream Systems Parts Store
MDI Pump Duty Mercury Float Switch With Piggyback Plug – Normally Open – 30 Foot - (MDI EM1OW3001 TC-2 B) - TG Wastewater
S-50-D Mechanical Float switch (Normally open) Sump pump application by CSH- New | eBay
10 ft. Piggyback Float Switch Cable Septic System Sump Pump Water Tank (5-Year Warranty), Mercury Free, Visible in Water SA-3100-3 - The Home Depot
Little Giant RFSN-9 115-Volt, Maximum 13-Amp - 1/2 HP, Pump Down Piggyback Tethered Float Switch for Pond, Sump, Effluent or Sewage Systems, 15-Ft. Cord, Grey, 599117 - Sump Pump Accessories - Amazon.com
Float Switches | Pentair AES
Float switch - Wikipedia
Superior Pump 10 Ft. Vertical Pump Switch w/Tapered Float Ball - Parker's Building Supply