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The SPDT float switch can be used to control a pump in tank filling or tank emptying opera-tion. Contacts located in the float will switch at 12 degrees above and below horizontal. Use a pipe clamp or cable tie to secure the cable to a pipe or weight in tank. The length of cable from clamp to float determines the difference between turn-on level and turn-off level. For larger pumps, use float switch to turn a relay on and off and let relay contacts control pump. Safe for domestic water systems. 2 year warranty.On When Full is used to turn on a pump when a tank is full and pump it down.