eli5,Why aren’t all urinals no flush/ no water?
In: Technology
Because urine does smell, quite badly, so it needs to be flushed. Toilets and urinals use [water as a ‘plug’](https://awphomeinspections.com/wp-content/uploads/2017/08/proper-P-trap-500×299.png) to prevent the smells in the pipes from getting into the room.
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