Kitchen sink doesn't drain - venting issues.

Old 12-21-05, 11:07 AM
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Kitchen sink doesn't drain - venting issues.


I am having drainage problems in my kitchen sink. We just purchased this home, it is just around 100 years old. The kitchen sink does not drain, or technically, it drains extremely slowly (20 hours or so). The main stack is ancient iron pipe: see this image:

In an attempt to solve the problem, the previous owner installed this inline vent:

It has not solved the problem and there is currently a leak from the right side sink drain where it couples sink to drain line.

The other fixtures drain with no problem. But the kitchen sink connects way below them on the main iron stack, and is significantly farther away from the main stack.

Please give me advice on how to get this kitchen sink to drain. Thanks kindly.

Micah Smith
Old 12-21-05, 12:03 PM
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Location: N.E. Arkansas
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micahdsmith, Welcome to the DIY Forums.
That is quite a long run for the drainline. Those Air Admittance Valves (that vent thing) usually work pretty good even though they are not code everywhere. I would say you have a clog consisting of soap and grease/oil. You can try an enzyme drain cleaner (not drain opener) such as Draincare. This contains bacteria that clings to and "eats" clogs of this type. It takes overnight and may take more than one application. Follow the label directions including using hot water. About $8 at Home Centers. You could also snake the line out. Remove the trap and go through the piping.
The strainer leak looks like a slip-nut. It has a hard plastic washer in it. Remove the nut and see if it is broken. Hand tighten when reinstalling. Good luck.
Old 12-21-05, 12:33 PM
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You were bang on. I pulled off the kitchen sink drain line from the main cast iron stack, emptied the kitchen drain line and looked into the main stack. Right at that point, just inside the main stack was a blockage which plumbers must be used to, but was extremely shocking to me! Here's an image looking into the main cast iron stack:

So, I called my roto rooter friend to come and help me clean out that line.

Much obliged for your help!

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