Toilet venting question.

accidentalplumber

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Toilet vent Question-1.jpgCan a low heel elbow be used to vent a toilet like in the top picture? Some say yes some no. What do you think?
 
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The picture is incomplete, but extrapolating from what shows, the answer is no, because debris can backflow into it and there is nothing to "wash" the debris out. A high heel would have the same prohibition.
 
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