Asked on Oct 15, 2020

How do I stop this leak?



I have a leak under the sink. I thought it was the supply line as the water was around that area. I replaced the supply line and it's still leaking. The problem wasn't the supply line. I know now that it is the pipe that feeds into the supply line. Where the dark brown putty (I assume) is. I don't know what these things are called. Can someone tell me so that I can ask for the right thing at Lowes/Home Depot?

The steel portion is the supply line. That screws onto the beige adapter (I assume that that's an adapter of some sort). Can I assume that the adapter is screwed onto that portion of the pipe where the brown putty is? I'm afraid that if I attempt to screw it off, that I will break it if it is not screwed on. That is definitely where the leak is coming from. Should I just get some plumbers pipe compound and put it where the brown putty is?

10 answers
  • I would definitely try that. Possible the seal at that area isn't tight and that's why it is leaking.

  • Ken Erickson
    on Oct 15, 2020

    It looks like some type of plastic pipe, but I have never seen that before. I would measure it and get a new coupling. The pipe needs to be cut and a new coupling installed. Turn off the house water supply, open the water valve to relieve residual pressure. Cut pipe close to, but clear of the brown gunk. The fitting will probably be a compression fitting and only require a couple of wrenches to get it installed. Then reconnect you braided hose and restore water.

  • William
    on Oct 15, 2020

    Can't tell from the photo if the pipe where the adapter (brown putty) is steel or not. If it is steel pipe then the adapter is screwed into it. You need to unscrew the adapter from the pipe slather pipe joint compound on the threads and screw the adapter back on. If the pipe is copper (doesn't look like it is) then the adapter is soldered to the pipe. You would need to heat the adapter to remove it. Clean the pipe and adapter and resolder it. Make sure you use flux. If the pipe is plastic (PVC) then someone tried to glue it on with some kind of brown adhesive which won't work. (doesn't look like PVC). If you want to replace the adapter with a new one take a clearer photo and take it with you to Home Depot or Menard's and show them what you need. Any questions just reply.

  • Pat
    on Oct 15, 2020

    I have had the faucet leak, drip down over the pipe and it looked like the pipe was leaking. Tightened the faucet and it was done. Hope you find your solution.

  • GrandmasHouseDIY
    on Oct 15, 2020

    To me that looks like pvc or pex pipe. Depending on what the pipe is will determine the type of adapter to buy. My money is on that its pvc because it looks pretty old and pex hasn't been around forever. Turn off the water, cut the adapater off as evenly as possible and take it into your hardware store to find an exact replacement. If its pvc you will want to buy pvc primer and pvc glue to put the new one back on. Tip: screw the new adapter to your new supply line first and then glue it on to your pvc pipe.

    • William
      on Oct 15, 2020

      If it is PVC pipe a metal adapter will not bond to PVC. It would have to be a PVC adapter. PVC glue melts both parts to create a bond.

  • Mogie
    on Oct 15, 2020

    Here is a site that tells you how to find exactly where the leak is coming from:

  • William
    on Oct 15, 2020

    If it is PVC pipe a metal adapter will not bond to PVC. It would have to be a PVC adapter. PVC glue melts both parts to create a bond.

  • Sandy
    on Oct 16, 2020


  • Dee
    8 days ago

    I would do two things before calling a plumber. I would get some plumbers white tape and put it around the threaded end. I would also put in a new washer.

  • Aub29638578
    7 days ago

    Take the photo to Home Depot with you. I've done it several times.

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