Reference for Shabbat 190:5

אמר רב אסי שמעתי כלי חרס שיעורו כמוציא רימון אמר ליה רבא שמא לא שמעת אלא במוקף צמיד פתיל והא רבא הוא דאמר מוקף צמיד פתיל עד שיפחת רובו לא קשיא

[iv] If it has a perforation large enough to allow olives to fall out, it is clean in that it cannot hold olives, yet it is still a utensil to contain pomegranates.<span class="x" onmousemove="('comment',' I.e., if it was explicitly designated for holding pomegranates, it is still a utensil and susceptible to defilement. ');">¹³</span> [v] If t has a perforation large enough to allow pomegranates to fall through, it is clean in respect of all things.<span class="x" onmousemove="('comment',' It is no longer susceptible, or, if it was defiled before it was perforated, it becomes clean. Henceforth it is susceptible to defilement only if its owner puts it aside to use as a mutilated vessel (Rashi). ');">¹⁴</span> But if it is closed with an airtight lid — [it ranks as a utensil] unless the greater portion thereof is broken.<span class="x" onmousemove="('comment',' The reference is to Num. XIX, 15, q v. If the vessel is closed with a tight-fitting lid, its contents too remain clean, unless the greater portion is broken, in which case it does not rank as a vessel and cannot protect its contents from the contamination spread by the corpse. ');">¹⁵</span> R. Assi said: I have heard that the standard of an earthen vessel is [a hole] large enough to allow a pomegranate to fall out.<span class="x" onmousemove="('comment',' I.e. — unless it has such a large hole it ranks as a utensil. ');">¹⁶</span> Said Raba to him: Perhaps you heard [this] Only of [a vessel] closed with a tight-fitting lid!<span class="x" onmousemove="('comment',' I.e. — that it affords no protection if it has such a large hole. ');">¹⁷</span> But it was Raba himself who said: If it is closed with a tight-fitting lid, [it ranks as a utensil] unless the greater portion thereof is broken? — There is no difficulty:

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