Adding a new shower

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Johnny Ong

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I'm planning to add a shower and wonder whether I can connect the shower drain to the toilet line as drawn, and whether a separate vent is needed. Appreciate any tips.
 

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hj

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Unless you can connect it to the vertical pipe ABOVE the toilet connection, you need a properly installed vent. And, by code, you would also need a 3" cleanout where you increase the pipe size.
 

Terry

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hj is right.
The shower trap arm needs to be above the santee for the toilet.
Also, a santee below the toilet fills the trap arm, as the waste hits the bottom and goes both ways, filling the uphill side.
It would need to be a true wye or combo fitting, not a santee.
A shower vent needs to be within five feet of the trap. Most of the time you would bring the shower in below the toilet santee, have it vented, and be within five feet. A toilet does a good job of messing with other traps.
 
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