Originally Posted by ckgreenman
Assuming it's above the waterline. The way it was described I think the seacock in question might be below.
A below-water-line seacock will still drain a sink, as long as the bottom of the sink itself is above the waterline!
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)