Is this an S-trap?

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ckl111

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This is the second drain in a month I've seen like this. Is it legal?

drain.jpg
 
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ckl111

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Assuming that the drain line is properly vented in the wall, is there a problem with a long tailpiece connected to a low p-trap?

I can only guess that it was installed like that for looks but I don't know how it ever passed inspection. This was in a two year old house so I would think it was done by the original "plumber".
 
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Terry

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In that situation, the longer tail piece is the way to go. Raising the p-trap above the vent like that creates a siphon of the trap, leaving it dry.
The purpose of the trap, is to have a water seal against sewer gas in the home.
Put the p-trap in-line with the vent, and add more tailpiece.
Or...cut the wall and raise the santee in the wall.
 
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