This dark oily liquid leaking from the drain pipe under the kitchen sink

drainkitchen-sinkleakpipesink

I haven't been under my kitchen sink in a while but recently went down there and found some dark oily liquid puddling directly under the drain pipe.

It was still wet and had the consistency of WD-40.

I turned the faucet on and there is no water leaking. And I have a SmartThings water leak sensor down there and that never tripped, so there was definitely no water leaks.

There wasn't that much of it, and I couldn't see where exactly it came from.

Should I be concerned, and should I do anything here? Wrap some duct tape around the pipe and call it a day?

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Best Answer

My first guess?

Food grease/water mix where the water has evaporated..

When hot water runs thru the sink the metal will expand and the cracked fitting will allow leakage.

To test: Put pan under fitting. Run hot water for 5 minutes. Watch for drips.

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