[C38] Head direct discharge and holding tank seacocks. Closed or open when sailing?

[Vassili Valayannopoulos]

Hi Folks

The head on my C38 is connected to a holding tank with a macerator pump and
its own discharge seacock and I also have a direct discharge hose with its
own seacock. I have a Y valve that allows to select one or the other.

When I want to evacuate the bowl into the holding tank I need to have the
direct discharge seacock open otherwise I am getting overpressure in the
holding tank that prevents me from pumping (even when the holding tank is
empty and even when the holding tank’s seacock is open).

I would assume that with the Y valve switched to holding tank and the
direct discharge seacock open the risk of seawater back flow is low when
underway but would love to hear your thoughts and how you handle this on
your boats. It would be annoying to have to open and then close the direct
discharge seacock every time someone needs to use the head.

Thanks in advance!
Vassili

Sailing on Naftaki
Winthrop MA
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