I am installing a new 30 in. vanity in my bathroom. The new unit has drawers at the bottom which means that there is now a shelf where there was none in the old unit. As a result, the trap now hits that shelf. I can not cut this shelf to fit the trap because there are drawers below it. I did raise the trap up by using coupling elbows. But when I tested the drain, it was slow.

I need to raise the trap 1 & 7/8 inch higher than it was. Is there a way to do this so the drain drains the way it should? Thanks.

Victor

I aam not sure what you mean by "coupling elbows" but that should not make you drain enough slower for you to even notice.

If you have room from the wall to the drain hole in the lavatory you might use 45 degree ells to offset it up enough.

Another thing you might look at is a flexable slip nut tail piece that will bend in somewhat of a Z but not that drastic, this might raise it enough.

If you added elbow you slowed the water down, every elbow decreases the flow. Shorten the drain pipe that comes straight down from the sink, reinstall your trap and horizontal pipe going toward the wall. As you near the wall at a 45 degree down elbow and then terminate at the wall with another 45 degree elbow into the pipe in the wall. Do not try to open the wall and raise the horizontal pipe.

I did raise the trap up by using coupling elbows. but when i tested the drain, it was slow Let's have some details about that. What are "coupling elbows"? Did you use two 90's and make a "S" trap? Does your new lavatory have a overflow opening? Give us more information. Regards, Tom