Central Air - Dry Bilge
Ever hear of a condensator?
Cut the overboard discharge water line and insert the condensator in the line. There is a third nipple on the condensator, it has a small hose that goes to the drain pan for the AC unit. The condensator creates a vacuum from the discharge line and sucks the water from the drain pan and sends it overboard with the discharge water.
Thus....a dry bilge
The condensator is the size of a cell phone, just a little thicker.
Tony B