An S-trap is obsolete and illegal because as the water leaves it, it can cause a condition called back syphonage, it pulls all the water out of the trap, leaving a dry trap. Dry traps let sewer gases flow back up through the fixture into the house. P-traps are designed to prevent syphonage. The trap retains a small amount of water after the fixture's use. This water in the trap creates a seal that prevents sewer gases from passing from the drain pipes back into the home.
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