Related for Terumot 8:7
הַמְשַׁמֶּרֶת שֶׁל יַיִן, אֲסוּרָה מִשּׁוּם גִּלּוּי. רַבִּי נְחֶמְיָה מַתִּיר:
A filter [used as a cover] for wine, [the wine] becomes forbidden if left uncovered. Rabbi Nekhemiah permits it.
Tosefta Terumot
[Wine in a container attached to] a strainer is forbidden due to exposure. [But] Rabbi Nechemiah says, if [the portion of the container topped by a strainer] was underneath, it is [considered] covered, even though the upper part was exposed. Behold, [the wine within] is permitted because a snake's venom is like a sponge, and it stays in its place.
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