Heater ducting huh? That's the first I've heard about that. My Grandpa said something about being able to select between fresh water and salt water, but he thinks the selector valve was a separate deal, and not something that was built into the toilet. It's been a long time though, and while he knew that boat inside out at one time, he can't recall too many of those details anymore. Understandable. Hell, I can't remember things about some vehicles I built 5-10yrs ago, and still own!
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