SEAFLO Boat Float Switch Automatic 12/24/32VDC Plastic White by Seaflo Suitable for use with 12v DC, 24v and 32v DC bilge pumps. Heavy duty flow switch is designed for the toughest applications Turn pump on when water level reaches 2 (51mm)-SFBS-20-01 For pumps drawing up to 25 Amps Turn pump off when water level reaches 3/4 (19mm)-SFBS-20-01