Reference for Avodah Zarah 63:7

וליטעמיך קנקנים של עובדי כוכבים ליתסרו למיזבן מאי שנא נודות ומ"ש קנקנים אמר רבא גזירה שמא יבקע נודו ויטלנו ויתפרנו על גבי נודו

But according to your reasoning then, it should also be prohibited to sell the earthenware flasks of non-Jews, for what difference is there between [leather] flasks and [earthenware] flasks? Rava said: This is prohibited by decree lest his flask be split and he takes the flask of the non-Jew and patches it on his own.

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