Found this in my bilge...what is it for?

[frey1esm]

While flushing all the oil and residue out of my bilge, I discovered this loose plug. What is it for?

16360

[crystal waters]

Is the end of the plug sealed or open?
Is the head of the plug square (four sides only) of 1/2 inch size?

[jasun]

Looks like a plug for a fake lake connection.

How big is it? Same size as the male end of a hose?


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[mabbore]

Thats a block plug. you pull them out in the winter when you winterize the block

[leetudor]

Engine drain plug. Someone might have dropped it and could not find it and bought a new one.

[SquamInboards]

Most block plugs are hexagonal-head, that looks like the square-head plug you'd find in the transom.

CLEARLY it's more likely to be an engine drain plug as others have mentioned, that got dropped in the bilge... but if you just asked me "what's this?" I would have said 100% that's from the transom.

[barelyfloating]

You guys sure that's not a muffler bearing?

[crystal waters]

Nah! C'mom, you know muffler bearings are always chromed!

[Jetlink]

It is the cap for the Halogen fluid reservoir.

[crystal waters]

Of course! Sorry i didnt recognise that right off!