Ultralife Reef ProduCounts AULFS10A Deluxe 10a Mechanical Float Switch Ultralife Reef Products Ultra Float Switch The design allows for simply turning over the barrel float to change how it performs They are excellent for water top offs or to prevent pump damage from sumps running dry. Ultralife Reef Products Ultra Float Switch The design allows for simply turning over the barrel float to change how it performs They are excellent for water top offs or to prevent pump damage from sumps running dry They are excellent for water top offs or to prevent pump damage from sumps running dry