No space! shower vent design question

will this work?


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undrgroundr

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I have limited space for installing a ptrap for a new shower and this is my best option. I am a bit worried that it might create a vacuum and suck the ptrap dry. Would this work?
 

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Terry

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That's an S trap that will siphon.

The vent can be within five feet of the trap, but the vent needs to come from the top, not below.

dwv_b2.jpg
 
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undrgroundr

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Thanks for the reply. I have one other option (see new pic), but do not have the space to make a 45 degree bend on the vent, so would have to use two 90 degree elbows to make the connection. Is this a better option?
 

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Jeff H Young

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thats way better and under the right circumstances can be concidered legal. If 45s work even better.
 
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