Mysterious Pipe in Basement

[Grantrog]

I am trying to finish my basement. When i bought the house it had all the plumbing roughed in for a bathroom. I had a plumber come over to my house he said I just needed to connect the vent pipes. He showed me a pipe with a metal cap on it (attached) and said that it is a vent pipe and I need to connect to it. Today when I removed the metal cap, water gushed out of the pipe. With such force that it knocked me off the ladder. It was a solid 6-8 seconds before the water stopped. So now I am wondering if he was correct about it being a vent pipe, or is it something else



.....please help me.

 

[Smooky]

Maybe it was rain water or a build up of condensation? If it was a drain something would have backed up by now. Have you tried to figure where it goes from there? If there is a sink or something up above that location, you could remove the plug and run some water and see if it comes out down there.

 

[Sponsor]

 

[Craigpump]

Lucky it wasn't dookie

 

[Grantrog]

It appears to go through the load bearing wall on the first floor. I'll take the cover back off and start running water throughout the house and see if I get any water through it. I'm hoping it was just rain water. It just seemed to be such a large mass of water with a crazy amount of pressue, it didn't make alot of sense to me.

 

[Terry]

It appears to go through the load bearing wall on the first floor. I'll take the cover back off and start running water throughout the house and see if I get any water through it. I'm hoping it was just rain water. It just seemed to be such a large mass of water with a crazy amount of pressue, it didn't make alot of sense to me.

When we run a test on a new home, the pipes are filled to overflowing up to the top of the roof vents.
That could be water left over from the test.

 

[FullySprinklered]

I learned to drill a hole in the stand-by vent pipe, installed to vent a future bath group. Last one I drilled, I soaked myself, my customer, and his son, who were exercising innocent curiosity concerning why the sheetrock on the stairwell landing was blistering up. The pipe was full of rainwater, several years worth, and shot out of there like crazy. I was up a ladder holding a bucket, knowing what was going to happen, but got surprised anyway by the force and volume of the water. There was a very slight leak where the cap was almost glued on, and that's what brought on all this excitement.