Quote:
Originally Posted by dad911
?? Very often the downturn comes with the disposal, and the trap connects to it directly.
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The disposal pushes out high velocity waste/water, but against a flat T-connection.
(fwiw-The "bend" in that diagram shows the disposal output pipe stub which is immaterial to flow.)
More important is the p-trap.
It looks like a "U" shape.
It is designed to let the waste water past, then leave a contained layer of fresh water to keep sewer gases from rising back into the house.
In an abandoned house where toilets are not often flushed, water held in the p-traps will eventually evaporate, thus letting city-street-sewer gas back into the house.
-You do not want s**t air pushed into your house from the drains.
-Nor backup liquid effluence filing up bathtubs and spilling across basement floors due to a clogged main.