My original setup had a three-way valve so I could pump the head to the holding tank, or overboard. I also had a manual "bilge pump" attached so I could pump the holding tank overboard when I couldn't get to a pumpout. I changed this arrangement so that it would be simpler. My current configuration has the head pumping into the holding tank, which can be emptied using the deck discharge at a pumpout station, or using the "bilge pump" to empty the holding tank overboard. Remember to use high quality discharge hose. It's expensive, but necessary so that you won't get smell emanating from the hose.
Alan Bergen C&C 35 Mk III Thirsty Rose City YC Portland, OR
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