7פִּטְפּוּטֵי כִּירָה שְׁלֹשָׁה הָיָה גֹּבַהּ כָּל אֶחָד מֵהֶן שָׁלֹשׁ אֶצְבָּעוֹת אוֹ פָּחוֹת אִם נִטְמֵאת הַכִּירָה בֵּין בְּמַגָּע בֵּין בַּאֲוִיר נִטְמְאוּ שְׁלָשְׁתָּן. וְכֵן אִם הָיוּ אַרְבָּעָה. נִטַּל אֶחָד מֵהֶן אִם נִטְמֵאת הַכִּירָה בְּמַגָּע נִטְמְאוּ שְׁנֵי הַפִּטְפּוּטִים שֶׁנִּשְׁאֲרוּ וְאִם נִטְמֵאת בָּאֲוִיר לֹא נִטְמְאוּ עִמָּהּ. עָשָׂה לָהּ שְׁנֵי הַפִּטְפּוּטִים זֶה כְּנֶגֶד זֶה אִם נִטְמֵאת הַכִּירָה בְּמַגָּע נִטְמְאוּ. וְאִם נִטְמֵאת בָּאֲוִיר לֹא נִטְמְאוּ. הָיוּ הַפִּטְפּוּטִים גְּבוֹהִין מִשָּׁלֹשׁ אֶצְבָּעוֹת וּלְמַטָּה מִתְטַמְּאִין עִמָּהּ בֵּין שֶׁנִּטְמֵאת בְּמַגָּע בֵּין שֶׁנִּטְמֵאת בָּאֲוִיר. וּמִשָּׁלֹשׁ וּלְמַעְלָה מִתְטַמְּאִין עִמָּהּ אִם נִטְמֵאת בְּמַגָּע אֲבָל אִם נִטְמֵאת מֵאֲוִירָהּ בִּלְבַד אֵין מִתְטַמְּאִין עִמָּהּ. הָיוּ מְשׁוּכִין מִן הַשָּׂפָה בְּתוֹךְ שָׁלֹשׁ אֶצְבָּעוֹת מִתְטַמְּאִין עִמָּהּ בֵּין שֶׁנִּטְמֵאת בְּמַגָּע בֵּין שֶׁנִּטְמֵאתָ בָּאֲוִיר. הָיוּ חוּץ לְשָׁלֹשׁ אֶצְבָּעוֹת מִתְטַמְּאִין עִמָּהּ אִם נִטְמֵאת בְּמַגָּע וְאִם נִטְמֵאת בָּאֲוִיר בִּלְבַד אֵין מִתְטַמְּאִין עִמָּהּ. וְאֵין מְדַקְדְּקִין בְּכָל הַשִּׁעוּרִין הָאֵלּוּ שֶׁכֻּלָּן הֵן מִדִּבְרֵי סוֹפְרִים:
The following laws apply with regard to trivets on which a pot is placed on a range. If each of them was three fingerbreadths high or less, if the range contracts impurity - whether through contact with a source of impurity or due to the presence of a source of impurity in its inner space - all three contract impurity. Similar laws apply if there are four protrusions on which a pot is placed. If one of the protrusions of the trivet is removed, a slight leniency is granted. If the range contracts impurity from contact with a source of impurity, the two remaining protrusions also contract impurity. But if the range contracts impurity due to the presence of impurity in its inner space, the protrusions do not contract impurity. If at the outset only two protrusions - one opposite the other - were made to support a pot on a range, similar laws apply. If the range contracts impurity from contact with a source of impurity, the protrusions also contract impurity. But if the range contracts impurity due to the presence of impurity in its inner space, the protrusions do not contract impurity. When the trivet was more than three fingerbreadths high, the portions that are three fingerbreadths high and lower contract impurity together with the range whether through contact with a source of impurity or due to the presence of a source of impurity in its inner space. The portions higher than three fingerbreadths contract impurity together with the range if it contracts impurity through contact with a source of impurity. If, however, it contracts impurity due to the presence of a source of impurity in its inner space, it does not contract impurity with it. If the protrusions are removed from the rim of the range, when they are located within three fingerbreadths of the rim, they contract impurity together with the range whether through contact with a source of impurity or due to the presence of a source of impurity in its inner space. When they are located beyond three fingerbreadths from the rim, they contract impurity together with the range if it contracts impurity through contact with a source of impurity. If, however, it contracts impurity due to the presence of a source of impurity in its inner space, the protrusions do not contract impurity with it. We are not extremely meticulous with regard to these measurments, for they are all of Rabbinic origin.