On Mon, 12 Dec 2005 20:49:04 +0200, Mike the Spamkiller
wrote:

We usually open the toilet intake seacock when we get to our boat and
have it open as long as we are under way. Have reconsidered that
practice since then.

==========================

You can flood via the output seacock as well if the right valves fail.

Both input and output shoud have vented loops well above the
waterline.