Commentaire sur Tevoul Yom 2:7

מפיה ומשוליה טמאה (whether at its rim or from its bottom) – from its mouth, it is ritually impure, for since all the wine that is below becomes the base for the upper part, it is a connection. And from its bottom also, since all the wine is conducted after the incision, it is a connection.

If a jug had a hole either at its neck, bottom or sides, and a tevul yom touched it [at the hole], it becomes unclean. Rabbi Judah says: if the hole is at its neck or bottom it becomes unclean; but if on its sides, on this side or on that, it remains clean. The jug has in it terumah wine and is sealed from above, but there is a hole elsewhere on the jug. According to the first opinion, no matter where that hole is, if a tevul yom touches the hole, all of the contents are disqualified. Rabbi Judah says that the contents are disqualified only if he touches either the hole on the top, at its neck, or the whole at the bottom. If he touches the hole at the top, all of the wine below is a base for the upper wine, so it is all considered connected. And if he touches the hole on the bottom of the jug then all of the wine will flow out of the hole below, so all of the wine is connected. But if he touches on one of the sides, the rest of the wine remains pure. Only the wine on the side he touches is disqualified. However, if there is a ratio of 100 parts pure wine to 1 part disqualified wine, then the disqualified wine is nullified and it is all pure, as we will learn in section two.

אבל נקבה מצדה מכאן ומכאן טהורה - and there is no invalidation/other than what he touched, and it is neutralized in one and one-hundred. But the Halakha is not according to Rabbi Yehuda.

If one poured [liquid] from one vessel into another, and a tevul yom touched the stream, and there was something within the vessel, then [whatsoever he touches] is neutralized in a hundred and one. If the tevul yom touches the stream flowing from one vessel to the other, he only disqualifies that part that he touches. If there is a 100 to 1 ratio of pure to disqualified liquid, then the part he touched is nullified and it is all pure. This is a similar situation to that in section one.

ונגע טבול יום בקילוח (and the person who had immersed himself that day touched the continuous flow/jet) – the continuous flow/jet alone is in validated, for the uninterrupted flow of liquid poured from vessel to vessel is not considered a connection (of the two liquids) -either for communicating uncleanness or for producing cleanness (see Tractate Taharot, Chapter 8, Mishnah 9), it is like impure priest’s due/heave offering that was mixed with pure, and is neutralized in one and one-hundred, like heave-offering/priest’s due with non-consecrated produce. And in this, even the Rabbis admit that a continuous flow/jet is not considered a connection to vessels, like the incision that is on the side of the jug/jar. And even though the liquids have no purification from their defilement, that is that it is not removed through dipping of a vessel, filled with unclean liquid, so as to make its surface level with the surface of the water into which it is dipped in a Mikveh like that for water, but for the reason of nullification, they are nullified with one in one-hundred. And specifically, when the person who had immersed himself that day/Tevul Yom had contact, the liquids are invalidated, because the person who has immersed himself that day/Tevul Yom does not defile. But with the rest of the defilements, he restores what is in the uninterrupted jet, he defiles everything that is in the vessel through contact.