Plumb trap in low clearance.

[Rockycmt]

I am putting in a new vanity. The vanity is a bottom drawer. this raises up the cabinet bottom inside. So the horizontal drain is only 4 inches off the bottom. So a P trap is not going work. Do i just do an S trap. Or is there a more professional solution?

 

[Terry]

If you raise the trap, you should add an AAV to break the siphon.
Or you can raise the drain the the wall, by cutting the wall, cutting the pipe, and raising the santee there. Assuming it's a vertical drain and not armed over from the side.

 

[Sponsor]

 

[Reach4]

You can cut a hole in the board above the drawer, and maybe notch the back of the drawer if you want to be able to remove the drawer while the P-trap is in place.

https://terrylove.com/forums/index.php?threads/vanity-drawer-hitting-p-trap.59445/
https://terrylove.com/forums/index.php?threads/p-trap-above-drain-pipe.55892/
https://terrylove.com/forums/index.php?threads/p-trap-above-drain-pipe-2.56031/

 

[Rockycmt]

I did a ptrap above the stack hole, right below sink. Then i went parallel to the back wall then down to stack hole. I hope this will suffice for just a bath sink. No siphon happening. I checked ptrap 3 times no issues.

 

[hj]

Fill the sink with water, then drain it and check for siphonage, (however you are doing it). You made an "S" trap, which is illegal.