Little Giant RVMS-10 115-Volt Piggyback Vertical Mechanical Float Switch for Pump up to 1/2 HP with 10-ft. Cord, Black, 599261 - Sump Pump Float Switch - Amazon.com
Alderon Altra Control Switch with 30' Cord - 2001162 - Free Shipping
Little Giant Plastic Float Switch in the Water Pump Accessories department at Lowes.com
Little Giant 599117 - Piggyback Mechanical Float Switch
Vintage NOS Teel Mechanical Float Switch 2P055 Level Sensor | eBay
Square D™ 9038CG36 Type C Mechanical Alternator Float Switch, 575 VAC | Steiner Electric Company