Has anybody used one of these switches to protect their sump or wet/dry filter pump from running dry?
http://www.amazon.com/Little-Giant-RS-5-Piggyback-Diaphragm/dp/B0032ALS6U/ref=pd_cp_hi_0_img
http://www.amazon.com/Little-Giant-RS-5-Piggyback-Diaphragm/dp/B0032ALS6U/ref=pd_cp_hi_0_img