Reference for Kelim 2:8

הַלַּפִּיד, טָמֵא. וּבֵית שִׁקְעוֹ שֶׁל נֵר, מִטַּמֵּא בַאֲוִיר. הַמַּסְרֵק שֶׁל צַרְצוּר, רַבִּי אֱלִיעֶזֶר מְטַהֵר, וַחֲכָמִים מְטַמְּאִין:

A torch is susceptible to ritual impurity, and the reservoir of a lamp is susceptible to impurity from its air-space. The comb-shaped filter of a water-cooler Rabbi Eliezer declares insusceptible to impurity; but the Sages declare it susceptible.

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