I add a diagram of the existing drain connection, and what I want to do, if it is possible. I will like to consider if is it possible to install the vent inside the kitchen cabinet?
It is possible to install the (wet vent) inside cabinet although I wouldn't recommend it, in a future the valve could fail an you'll have a nasty odour in your kitchen for some time. Also is not good for resale value.
What I would do is to take the vent all the way up through the roof, or out through an exterior wall.
Please see the pics of what it is in there and what I want to do.
Let me know if is it possible.
Just a picture.
Ye,s you can do it as you propose in the second diagram. just make sure the entire pipe under the floor is sloped 1/4" per foot towards the drain stack.
Also if you have the room, install a Y fitting under the floor instead of a T fitting, you'll get better flow that way.
Thanks guys for you help.
Unfortunately it's against code to run the drain/vent like the second drawing. The maximum allowable drop in drainage after the trap is one pipe diameter before connecting back into the vent. If the drop is over one pipe diameter the trap seal can be siphoned out.
I've attached a couple of pictures. The first one showing the second drawing piping configuration, which is against code. The second one explaining the one pipe diameter drop rule.
I hope this helps.
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