Cabin sink drain plugs popping out.

[nvmoose]

My wife and I crew as a couple and have logged about 5K - 6Knm miles on a variety of vessels.

We have also chartered a sailboat in the San Juan Islands and in Greece as part of a flotilla.

So far in each vessel that we have sailed with the cabin sink drain plugs will pop out when underway and under certain conditions. I think I understand the mechanics of the situation with outside sea water putting pressure on the through hull and popping the plug out. So....

In our continued effort to be good crew and not waist water we were wondering if this is a common problem or are we just inept at figuring out how to keep the drain plug in?

Any advise or suggestions are appreciated.

nvmoose