S to P trap convert

petros151

in an old house where drains go thru floor is this conversion a good way to go ?

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oh'mike

Both pictures are S traps--Add a T where the right hand 90 now sits--install an AAV to the top --then you will have a P-trap

Air Admittance Valves are not code in some areas--so check first.

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petros151

so like this?

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oh'mike

Good!! There you have it----

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petros151

ok thanks, this looks simple to do!

wctekkk

to add to petros151 30" max

petros151

I might be going 20" from the TEE up to the AAV so I should be fine thanks!

rjniles

The AAV should be higher than the stand pipe.

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petros151

sorry newbie here. Higher than what part of this diagram....

I am putting this under the sink in a sink base cab. I cannot put things in the walls. So the sink base is up against the wall and the highest I can go with an AAV is at the top of the cab. so that would make it a bit higher than the level at which the sink connects to the drain. I have an illustration to show what I would do (have not done it yet but HOPE to do this TOMORROW) THANKS !!!

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rjniles

Your earlier posts showed a laundry standpipe not a sink. The AAV is supposed to be above the flood rim of the sink.

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wctekkk

2"drain would be nice

rjniles

For a laundry standpipe- yes. For a sink 1.5" is fine.

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petros151

yes my error I started just asking about P traps and S traps in general. But in fact this is a kitchen sink set up with a D/W I'm attempting. I can quickly see I am in trouble here.

as to the AAV In my case the base cab is up against the wall and as of now there is no where to put the AAV except at the top of the cab which is below the flood rim.

so in this case is it worthless to try an AAV at all? and this another issue-- I am going to have a Dish washer drain into the same drain as the sink. here is another drawing... gulp

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wkearney99

When the AAV is lower than the flood rim of the sink then water will overflow through it first, leading to a leak you won't seek at the sink first.

wctekkk

thought he was dumping his a/w into sink. my bad