7

I have p-trap entry in drain at 16" above the floor. However, vanity that I got has lower drawer which has top at about the same height. There is also about 4" clearance behind drawer. I was told that the only way to install p-trap would be to cut back of the drawer.

So I wonder if it's really the case. Can't drain entry be just raised with some additional elbow so p-trap enters it 6" higher? Any other options? Is it possible, for example, to install p-trap sideways so it fits into those 4" behind drawer?

Uncle Meat
  • 996
  • 7
  • 18
  • 34

7 Answers7

13
  • As long as the p-trap is lower than the drainage from the basin then you can install it. It can also be lower than your exit pipe you need to drain into
  • You attach the p-trap directly to the drainage and manuever the p-traps exits into you existing drain.
  • It is not ideal to have the p-trap below the the exit drain because water gravity has to force the water out instead of it flowing downwards naturally. They both work and have seen it many times. But essentially anything below already creates its own p-trap- so using another is redundant.
  • If the p-trap is to tricky just create your own loop from pvc
  • For ease of manageability you can use a flexible waste connector pipe from the p-trap to your drain pipe.
    enter image description here

Some twisted to fit p-trap

enter image description here

Small pcv p-trap

enter image description here

A sideways p-trap is useless, you might as well connect it straight line.

enter image description here

Theory of a p-trap

enter image description here

You might want to look into s-traps also

enter image description here

enter image description here

Piotr Kula
  • 5,959
  • 22
  • 32
12

Here is what I ended up with. It doesn't contradict the code and inspector signed all the papers. I am not sure if he really looked at it, though.

enter image description here

Uncle Meat
  • 996
  • 7
  • 18
  • 34
0

I had a similar situation to you and ended up doing what you see in the picture below. The old vanity did not have a bottom drawer, so the bottom of the p-trap was below the wall drain pipe. I got the parts necessary for this in an s-trap kit from home depot, and then got a 1' section of PVC that I cut with the miter saw to join the elbow to the trap.

sink trap

Aaron
  • 6,491
  • 7
  • 40
  • 61
0

I am having the same problem as the original poster. My rough-in drain is 16" from the floor, however my new "modern style" vanity for my ensuite and main floor washroom need clearances above 18". The good thing is both vanities have a 4" space from the back of vanity to the drawers. ( in other words, the drawers are not the full depth of the vanity ).

I was about to give up and call a plumber...but I found a solution from a manufacturer. http://www.canplasplumbing.com/plumbing.aspx?categoryID=383

This solution gives me the ability to make a sharp 90 degree from the wall (copper to ABS) and the install my p trap sideways. The trap is installed below the drain line.

My solution looks similar to the original poster's photo solution but I used ABS and did a 45 and 45 from the sink hole to the trap. It looks like he used 90 and 90 degree turns.

brian mak
  • 1
0

You simply need to install an auto-vent, after the p trap at the highest point of your down down turn. It would be impossible for the s portion of the trap to auto siphon. If auto vents are allowed in your area.

OnSite Renovations North Van
  • 1
0

tail piece off set before p trap connection is ok, similar basin drain off set connection for handicap plumbing. S trap is not acceptable.

user45528
  • 1
-2

Just use a tail piece extension. Why are you adding all this extra work. Its very simple. If your drain line coming out of the wall is lower than the the tail piece of the fixture its serving, then extend the tail piece with an extender. This is exactly why they make em. All this extra work your doing is 1. Illegal in most states 2. Has the potential for a lot of leaks. 3. Is not necessary.

Chris Schlegel
  • 1