In article >,
Mark Lipton > wrote:

> Lawrence Leichtman wrote:
>
> > Then what are the glass closures called? I have run into these several
> > times now.
>
> The most common brand of glass stopper is the Vino-Lok, made by Alcoa
> IIRC. I mostly see it on lower-end German Rieslings, but I'm sure that
> others use it, too. No idea about the aging curve of wines sealed that
> way, but I'd guess that its oxygen permeability is even lower than that
> of screwcaps. They resemble fire-polished ground glass joints with an
> O-ring seal, and we use similar seals in the lab when we want something
> close to a hermetic seal.
>
> Mark Lipton

Yes, this is what I found on two bottles. I had never seen it before.