Food grade gaskets?

Hi there, with all this time at home I have been trying to tidy up and fix up some things that have been lying around for a while.

I have a nice vacuum flask for which I lost the gasket that was in the lid. Does anybody know of a relatively cheap source for a food-grade gasket that can hold hot liquids? it’s a flat one for sealing against a sharp edge and I think it’s ~1.75" diameter. Any ideas?

Thanks a lot!

Brian

Try looking for silicone gaskets for canning supplies. Like this https://www.amazon.com/Platinum-Silicone-Sealing-Mason-Jar/dp/B012UP6WWC

Edit: although these might be too big

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Thanks, but they do look a little too large.

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Buy some silicone sheet and use an exacto knife to cut one out?

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Home depot does have silicone grade silicone sheet

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