Join Date: Jan 2007
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I installed a lavac last year, with one y-valve (to pump overboard or to the holding tank), and another to select whether the hand pump pumps waste from the toilet, or from the holding tank (to empty tank when out past 3 miles). there is actuallly a 3rd y valve installed on the top of the holding tank, wheer you choose to direct the waste toward the lavac pump - overboard, or to the deck pump out.
Although it seems complicated, it does allow for a lot of flexiblilty.
One comment on the suggestion to direct all waste to the holding tank. We often sail a mile or so from shore, and the direct overboard allows the girls to pee, without filling up the holding tank (quickly). Guys can use it too, or piss overboard, just cause they can! If someone needs to use it for more than that, they switch the y-valve to tank and then back to overboard.
Then we have the option to pump out later at the marina, or discharge past 3 miles. With the flush water, you will fill a tank quite quickly if you use it for al the beer induced peeing.
Since we have washrooms at the marina, we don't use the head much at the dock.
The only downside to the extra valves is extra hose to connect them all, which takes more water to flush clean.