I am trying to remedy two washing machine leaks, one mysterious, one not so mysterious.

First, the not so mysterious leak. When running a large load, water backs up and spills out the top of the box/pvc pipe that the washer drain hose is fed into. This connects to the pipe that the kitchen sink drains into, glugging sound can be heard from kitchen when washer is draining. I've disconnected and snaked the P-trap at the bottom of that pipe. What should I be attempting next?

washer drain hose into pvc pipe

Now, the mysterious leak. Running a small load does not result in water spilling out of the top of that box. However, I've kept noticing moisture on the floor even though the box and pipe connections feel dry. I just watched as the washer drained and the moisture started to appear without any leaks or drips. Somehow the water is coming from beneath the concrete slab? How/why is this happening, how/why to fix?

moisture appears without visible leaks moisture appears without visible leaks

  • If the water is coming back up and leaks, clean the clog in the drain line
    – Traveler
    Commented May 18 at 18:36
  • 2
    Unless the second leak is coming from the machine(unlikely) then you probably have some cement cutting to do.
    – crip659
    Commented May 18 at 18:38
  • How is the gray fitting connected to the white ones, and connected to the stub out of the slab?
    – Huesmann
    Commented May 19 at 12:56
  • @Traveler I assume your suggestion is in regard to the first leak that I described. I've already cleaned the straight pipe, through the P-trap, and the connection to the main stack. Commented May 20 at 11:57
  • @crip659 I was worried about that possibility. How would I go about doing that, and what might I expect to find? Commented May 20 at 11:58


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