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pkovo 03-05-2009 07:47 PM

Mystery plumbing in Basement???
My house is a amall ranch with a full basement built around 1950. I have a small plug in the floor. I can't figure out what it is.

I was thinking perhaps at one point it was a sump pit that was sealed over. The cement has obviously been patched around the pipe about the diameter of a sump pit. Perhaps the basement was always dry so someone decided to seal it, and leave a plug in case they ever needed to drain the basement?? Maybe it connects to a perimeter drain sytem?? Someone suggested perhaps it was an old drywell which seemed odd to me but who knows. There are old water hookups in that area, and I believe at one point there was probably a washer and dryer there. Can't connect to a storm sewer as we don't have any. My sanitary sewer line runs out about 4' above the floor so it can't connect to that. It's about 4-5' from the end basement wall, and about 2-3' from the back wall (roughly).

I started to chip away at the concrete at one point but decided that might not be a good idea. Of course I've tried to remove the plug without success as well.

Pics below. Any Ideas??????

mrivers 04-18-2009 08:21 PM

Hi pkovo,
If I had to take a guess, I would say it used to be a shallow well, or a supply line from a well located somewhere outside the home.

Is your home currently on a city/rural water system?
If so do you know when it was connected to that system?

Nestor_Kelebay 04-18-2009 10:26 PM


Where I live, if a drain pipe under your concrete basement floor changes direction, then the plumbing code requires that a clean out be installed at that change in direction so that each straight section of pipe can be cleared separately.

I really don't know the reason for this rule.

So, it's purely a guess, but it might be that there's a change in direction of a 1 1/2 inch drain pipe under the concrete at that spot.

I'd be inclined to use an electric impact wrench to remove that plug and put in a new one with antiseize compound on the threads. That way you'll stand a better chance of getting it out if and when you need to.

glennjanie 04-19-2009 04:24 PM

Hello PKovo:
It could very well be a washer drain that used to drain into a sump where a pump would take it out.

Quattro 04-20-2009 07:27 AM

Looks like a good place to trip!

CraigFL 04-20-2009 09:53 AM

Personally, I wouldn't touch it. What if it's a sanitary sewer line and the pipe breaks off? Remember what they said about curiousity....

inspectorD 04-20-2009 03:43 PM

Do you have a steam heat system? If you do this could also be the return condensate line back to the boiler.

Other than that it is most likely a clean out plug to an abandonded sink line from a washtub in the basement to the outside drywell. We find them all the time.

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