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Ultima Auto Float Switch for Johnson 12V or 24V bilge pumps. Upon immersion in water, switch automatically turns on. Mercury-free design uses patented detector cells to detect fluids and initiate pumping.
Johnson's unique detector cells are sealed so they are never in contact with the water, won't corrode, and are unaffected by oil or debris.
September 14, 2020
Only one of the two I ordered worked. Need to test before leaving store. Using for bilge pump.
March 16, 2018
Had two of these. One in the bilge failed "off" (thankfully had a second pump powered by a different brand switch). One in shower sump failed "on".
May 3, 2012
Expensive! It has cost me two starters that were ruined by high water (Rain filled bilge after auto switch failure). My 2006 Glastron SX190 Volvo Penta sits on a powered boat lift alongside my dock throughout boating season but is subject to rainfall that fills the bilge when the magnetic reed switch fails when water seeps in. I have disassembled the failed switches and found the black enclosures had leaked and the inside connections were saturated and corroded. It is only May and another Johnson/Mayfair unit has failed already. I don't want to have to replace another starter so I'm looking for the best bilge pump and switch that is RELIABLE. Expensive doesn't necessarily mean the BEST (especially in this case).
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