Fruits Of My Labor (A-113)

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There are two or three Seadog drainplug models.
I have the plain all nylon ones (520010-1) which have a short collar (3/8") that fits into a 1" drilled hole.

A plug screws into the collar with a short non-snag handle and has a thick flat red washer that seats good into the fitting and sure looks like liquid would be kept from coming out or going in.
Has a couple 'legs' that loosely captures the unscrewed plug in the fitting when open so it doesn't run off down the scupper.
Standing up it looks like a cute little one-eyed robot. Smart design, imco.
Bedding surface thoughfully incise-molded to hold caulking.
Nothing much sticks/bonds to nylon, so I use non-curing always sticky butyl tape or tube to ensure a seal.

Can use polysulfide on nylon, but imco it will eventually cease to stick when rubber finally cures. That may allow disassembly, but also water to get thru.

Defender has them for $2.95.
Somebody else has them for a better price....like around $2?
Drill 1" hole - goop the fitting - push it home - add two #10 FHscrews.
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EDIT. Just came off a search (using 'the Find' engine). One outfit (never heard of) called www.northeastmarineparts.com has them (w/ a gray washer) for $1.81 - nothing on S&H. There are other makers of this type of plug - Seadog (from the pix) still looks the best.
Being plastic the plug can be altered. The legs can be snipped off to allow complete removal of plug. Or the molded 'ring' on the legs can be cut to allow the legs to be compressed for takeout. And putting back.
A locker whose bottom is where the hull is rising at an angle may need a legless plug. (snip 'em off)
On thin ply panels a backing block may be necessary to increase thickness for the screws to get some bite and also not poke thru.
Hope they work for you!
http://www.northeastmarineparts.com/...rain-plug.aspx

SeaDog Black Nylon Drain Plug - 520010-1
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Teak and white oak are truly indestructable $$$$$ marine woods.
Pearson used honduras mahogany $$ for hidden cleats/painted framing and such in A-338. May seem wasteful, but milling produces a bone pile of strange pieces that can find a place in framing and blocking. No splinters, holds fastenings good, easy to drill for fastenings, forgiving, doesn't warp, smells good, hand planes easy, glues good, doesn't need epoxy soaking, rot resistant, yabbadabbadoo! Love the stuff.
Next to walnut, it's a great treat to work with the highest regarded furniture wood of all time.
Never see a rudder or cockpit coamings made with walnut. Orchard walnut is probably just as durable as honduras and spectacular grained.
Asked a yacht designer why we never see it on boats - he said, it is 'unlucky'. Never verified that.