I'm replacing an old galvanized pipe from my kitchen drain to the basement. The drain pipe corroded a couple feet down the line and is leaking. I'd like to replace the entire run from the sink to the sewer with PVC.

The sink drain runs into a wall behind the cabinets and then straight down into the basement.

I don't know how to remove the section in the wall without cutting into the back of my fancy-ish new-ish cabinets and taking out drywall.

It looks like there's a nut right on the wall. If I remove that nut should I just be able to pull the pipe down into the basement?

Under the sink, into the wall

From the wall, down to the basement

  • Is the bottom picture form before the cabinets went in, or is that your current pipe access?
    – Comintern
    Apr 9 '16 at 2:45
  • The bottom picture is from the basement looking up. The pipe that's coming down into the elbow is running in the wall behind my cabinet. This and the area in the first picture is my only access. Apr 9 '16 at 3:04
  • Just out of curiosity, how do you intend to get the new pipe in after the old one comes out?
    – Comintern
    Apr 9 '16 at 3:07
  • 1
    I was hoping installation was the reverse. But I just realized I think there's a vent going up through the wall to my roof that's fixed to this section too. I'm starting to think I'll have to suck it up and cut into that wall. Apr 9 '16 at 3:09
  • It would be if it were just a straight pipe, but it's going to have a tail piece sticking out the side of it.
    – Comintern
    Apr 9 '16 at 3:12

As you suspect, if the drain is plumbed correctly, there is a vent pipe extending above the drain connection inside the wall. The connector is probably a wye, and there is no way to free the pipe without opening the wall.

  • I'm just going to run pvc between what's left of the galvanized today. It's not what I wanted but I'm not ready to open that wall up yet. And I want to do dishes today lol! I'm sure I'll be looking at this again in a couple of years when the rest of the galvanized starts to go but hopefully I can get some professional help ;) Apr 9 '16 at 11:40

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