Avodah Zarah 56B

ולרבא, דלא שאני ליה, מוקים ליה כתלתא תנאי.

The Talmud comments: And according to Rava, who explains that the Mishnah with regard to wine used for libations is in accordance with one opinion whereas the Mishnah with regard to tithes is in accordance with another opinion, and he does not hold that the case of wine used for a libation is different, he interprets it as a dispute between 3 tanna’im.

מה שבבור אסור והשאר מותר. אמר רב הונא: לא שנו אלא שלא החזיר גרגותני לגת, אבל החזיר גרגותני לגת ⁠— אסור.

§ The Mishnah teaches: Once the wine descends into the collection vat, that which is in the collection vat is prohibited, and the rest, which did not yet descend into the collection vat, is permitted. Rav Huna says: The Mishnah taught that the rest of the wine is permitted only in a case where he did not return the wicker basket [gargutni], which is used to strain the wine on the way to the vat, to the winepress. But if he returned the wicker basket to the winepress, even the wine remaining in the winepress is prohibited, as the wine in the basket renders the wine in the winepress forbidden.

גרגותני גופה, במאי קא מיתסרא? בנצוק. שמע מינה: נצוק חיבור! כדתני רבי חייא: שפחסתו צלוחיתו. הכא נמי: שפחסתו בורו.

The Talmud asks: With regard to the wine in the wicker basket itself, in what manner is it rendered forbidden? Apparently, it is rendered forbidden by the stream of liquid that flows from the basket into the vat below, thereby connecting the wine in the basket to the forbidden wine in the vat. If so, conclude from Rav Huna’s statement that an uninterrupted stream of liquid is considered a connection. The Talmud rejects the inference: The reason for Rav Huna’s statement could be different, as R' Ḥiyya teaches that if one fills a non-Jew’s flask through a funnel, the wine in the funnel is rendered forbidden in a case where the level of the wine in his flask rose and reached the funnel. Here too, Rav Huna is referring to a case where the level of the wine in his collection vat rose and reached the basket.