Two prong Water Probe for Breezair EXH, EXQ, TBA, TBQ, CPL, CPQ, CVQ, is required as part of teh automatic water managemnet system.
Once water is detected by the probe. the pump will turn on. It also measures the salainty of the water, which tells the cooler when to dump water.
Not suitable for 12V systems used in the TBQi and LPQi Coolers