PHCC PRO SERIES, Fits PHCC Pro Series Brand, For 1APP3/1APP4/4CUK2, Dual Float Switch - zz_62NA18|FLOAT-DLCH - Grainger
Briidea Hi-Lo Sump Pump Controller with Dual Float Switch and Overload Protection(Black) - - Amazon.com
Water Level Sensor, 6803 Bearing 12V Ball Float Switch Dual Ball Stainless Steel Liquid Level Sensor Float Switch for Water Tank, Pool and Fish Tank( Floating Body 100mm): Amazon.com: Industrial & Scientific