---

Jeff, my set up was I think the same as Garris and here is a detailed description of the drains and their states. Going from the stern forward:

Transom (1): One transom tube dead center and at the bottom of the engine well. It also had the goofball "1-way" valve that was mounted on the outside of the of the transom. It is now somewhere in the woods. :)

Floor Drain (1): Located in the main Bilge Pump "locker" starboard and aft. Drains thru the hull.

Fish Locker Drains (2): One tube leads from the fish locker to the Engine Well. It also had a goofball valve on the engine well side of that partition. It too is in the woods. The other fish locker drain is a thru hull drain

The former owner installed (or had someone install) a plastic drain pipe between the fuel tank cavity and the fish locker. Should you decide to keep your V-22 after finding the vast amount of knowledge on this site :), I'd definitely recommend you do the same. I'm going to eventually replace this pipe with a brass tube.
You'll notice the drain tubes near the top of the fuel tank. The idea was that water would sit on top of the foamed in tank and exit through those tubes. For the most part the water seeped to the bottom of the fuel tank cavity with nowhere to go.


Cabin Drains (4): Floor, Stb locker, Port Locker, Anchor Locker

Transom: Plugged
Fish Locker Thru Hull: plugged
Fish Locker to Engine Well: plugged
Floor Drain: Plugged
Cabin Drains: All Plugged
Fuel Tank Cavity: Unplugged

So I keep all of my drains plugged with the exception of the fuel tank cavity drain but I'm also on the tamest of waters. I'm on a simple lake at the moment (Smith Mt. Lake), but I figured the boat would not swamp if I had water trapped in my engine well or fish locker for that matter. If I were out on the big waters I will still plug the transom drain (from the inside obviously) but leave the fish locker thru hull open just in case I caught a big wave over the stern. I will likely someday add a second bilge pump to the engine well like Garris.

I replaced all of my thru hull drains a couple years ago. I still need to replace the tube that connects the fish locker to the engine well but will save that for next season.