Under Sink Leaky Pipe!

Hello,

I am new to this and I hope you can help. I have a very old house, built in the 30's. I replaced all the piping below the sink and the drain pipes goeas straight into the wall with no real security. Where it goes into the wall it is not completly sealed so it has a drip leak. I tried to cover the seam with plumbers putty, it has hardened but the same leak appears! Any help or suggestions would be greatly appreciated! Thank You,

Frazier

a picture and/or more info will be helpfull. What kind of pipe, steel, abs, pvc, cast iron? glued or threaded or nothing as you say it has no security.

It is pvc going into a cast iron pipe, the cast iron is in the wall. There are no threads on the pvc, I do believe there are threads on the cast iron. That is the way it was when I replaced it. I tried silicone and plumbers putty with the same results, drip leak coming from the bottom of the connection (seam). Thank You!

Frazier

Often you will have a galanized pipe nipple threaded into a cast iron fitting. The end thread uses a slip joint nut and rubber slip joint washer. Kitchens are notorious for desolving the lower portion of the metal pipes. You may need to replace the pipe nipple through the wall.

Plumbers putty is not used for that type of repair. Think of it as playdoh. Do you think a lump of clay is going to do much for you? You have to have sound pipe and fittings, and when you do, there will be no need for anything else.

You would NOT have cast iron pipe with a thread on it. It is probably galvanized steel, and if so you need a "female Marvel/De Sanko/trap adapter, (whatever they call it in your area)" to screw onto it and then the trap slides through it with a slip joint connection to seal it.