Reference for Eruvin 173:18

והא כי אתא רב דימי אמר רבי יוחנן מקום שאין בו ארבעה על ארבעה מותר לבני רשות היחיד ולבני רשות הרבים לכתף עליו ובלבד שלא יחליפו

was less than three handbreadths wide, but if it was three handbreadths wide no bucket may be lowered to draw water from it.<span class="x" onmousemove="('comment',' Lit., 'and fills'.');">⁴⁰</span> R'Simeon B'Gamaliel ruled: If it<span class="x" onmousemove="('comment',' This will be discussed presently.');">⁴¹</span> was less than four handbreadths wide a bucket may be lowered into it and water may be drawn from it, but if it was four handbreadths wide no bucket may be lowered to draw water from it.

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