www.iFourWinns.com

Found this laying in my bilge this past weekend.. No water, and the bilge is bone dry. Ran around the lake quite a bit on Saturday night, and still bone dry.. Looks like some sort of plug for something, but is a pretty light weight plastic as well.. Hell, I don't know, now that I think of it, maybe its a cap for the tube the waste tank vent filter came in that got away from me on install?

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2004 Four Winns 328 Vista
1997 Larson Cabrio 290 - sold
1988 Rinker Fiesta Vee 248 - sold

It looks like the plug on a fuel tank fitting from the manufacturer.

Just a guess. I had one like that in a replacement fuel tank I just installed in the fishing boat this year.

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Jon & Rhonda

'88 235 Sundowner
5.7L OMC Cobra
'01 F150 4.2L

Definitely looks like a "temporary" plug, meant to keep something clean inside during shipping, then be disposed of when the item is installed. A company called capplugs makes lots of them. Your probably right about it coming from when you installed a new tank. I wouldn't worry about it.

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"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings

It looks a lot like the caps I have except mine are grey. Mine are for plugging the receptacle of the table legs when you take the table out on deck. I assume so you don't break a toe in the opening.
Below is not my table but for illustration. When you take the table leg out you have that receptacle in the floor that's a few inches deep.
http://www.boatoutfitters.com/corian-bow-table-with-base

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--2002 3880 Regal Flybridge | Twin Merc 8.1HO **Seven**
--2003 AB 13 VST Console Inflatable | Tohatsu 40hp TLDI **Phish'n ski**
--310 Mercury Inflatable | 1982 9.9 Johnson