Reference for Eruvin 173:1

חוקק בה ד' על ד' וממלא

one cuts a hole of four handbreadths by four<span class="x" onmousemove="('comment',' Thus leaving a margin of 24 - 4/2 = 10 handbreadths around it.');">¹</span> and may draw water through it.<span class="x" onmousemove="('comment',' Even though no partition had been put up round the hole. The margin round the hole is deemed to be bent downwards so as to be forming a suspended partition of the required height of ten handbreadths and extending downwards into the water, and thus constituting a private domain through which it is permitted to take up the water from the sea into the balcony.');">²</span> Said Abaye to him:<span class="x" onmousemove="('comment',' Rabbah.');">³</span>

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