Hi tthom, I'm not sure that there is one. I purchased an 05 in the fall and have not found one yet. There is a cavity under the rear birth but there is not a bilge pump in it . The through hull if there for the ac , shower sump and fresh water pump. Maybe Al will chime in after all he designed the boat.
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At the helm, turn on the bilge override switch, then go into the cabin and start digging. You should be able to hear the pump.