Any ideas what these are for?

[GuidoY]

They're about 3/16" or so thick, rubber. Came with the boat (along with other "treasures") so like to use them if possible.

Any insight helps.

Thanks much!

[trashpad]

Looks like tank access port gaskets

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[Greenhand]

They look used. If you want spares, you should identify them and replace, otherwise, just toss them.

[roverhi]

Some kind of gasket. If you throw them away, you will find the fitting that leaks because they are missing the day after.

[Capt Phil]

Look like head gaskets to me... had a few spares from my raritans and wilcox-crittenton's when I installed vacu-flushers. Should be able to check this as they were included in rebuild kits, I think... Phil

[GuidoY]

Great, some things I hadn't considered. Kept thinking "too big to be drive savers, too small to be mast partner seals (if there is such a thing)"
Didn't think about the head, which I only think about when I have to


Thanks again!

[Paul L]

The top one looks like it belongs to an anchor chain deck plate entry.

[Ukeluthier]

90% certain the first one is a deck sealing gasket for a hawsepipe fitting and the second is the gasket between the bowl and the base for a marine head.

[hellosailor]

Dust them with plain talcum powder (prevents oxidation and aging) and double-seal them in a Ziploc freezer bag (which allows less oxygen in) and then just file them someplace flat. If you have spares, you never need them. Much easier than needing them and not having them.

[Orion Jim]

The second one is a Groco head gasket used between the base and bowl. I used my identical spare two weeks ago. No sure on the first one, don't want to speculate.