How do I install a missing P-Trap on a straight pipe from the tub


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Old 07-19-19, 11:06 AM
J
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How do I install a missing P-Trap on a straight pipe from the tub

I've got a tub that has a drain essentially going straight (maybe off by an inch) 17 inches down to the the waste line.

Its connected with a corrugated pipe, that then goes into a 2". There's no P trap and I'm getting sewer gas.

Problem is... How do you install a P trap in an essentially straight run. Anything I can think of will end up being an S trap.
 
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Old 07-19-19, 04:10 PM
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You sure there is no trap down below the slab? Is that a gravel box? If so dig down and look..

If not you will need to cut pipe low, put an elbow on it. Then put trap on as high as you can on the tail piece. Then pipe to that elbow.. Should be 3 ell. possibly att st ells
 
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Old 07-19-19, 05:52 PM
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Sorry, I might not have been clear. The tub is on the first floor, there is a basement beneath. In my illustration the brown is a waste pipe. I can see that there's just a straight run into it from the tub. From further research I think whatever I do needs a vent. So I was going to do a P trap to a sanitary T with an air valve on the top of the T.
 
 

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