Descriptions:  A bilge pump float switch is a smart device used in boats that turns on a bilge pump when the water in the bilge reaches a certain level. It is a must-have in any boat that is left unattended for any length of time, as all boats tend to leak at least some water. This switch is submerged, so you need to waterproof the electrical connections and hang the wires to ensure they stay as dry as possible.  Ideal flow sensor for bilge pumps   Heavy duty flow switch is designed for the toughest applications   Our bilge pump float switch is safer than mercury switches, this switch utilizes a mercury-free rolling ball mechanism and includes an exclusive anti-spike feature to prevent the rapid on/off cycling encountered with some switches. Made of rugged thermoplastic. Universal design works with all 12V, 24V and 32V bilge pumps.   1.       Turn pump on when water level reaches 2'' (51mm)  2.       Turn pump off when water level reaches 3/4'' (20mm)  3.       Ideal flow sensor for bilge pumps  4.       Heavy duty flow switch is designed for the toughest applications Application:  The float switch is good for yachtsmen, commercial fisherman & boat builders all over the world.For use with pumps drawing up to 20 amps. Package Included:  1pcs Switch