Sewer Gas Smell coming from roughed contained by plumbing?

We own a house where the previous owners started the plumbing for their raining bar. We have a plumber come and cap sour the pipe that was supposed to be used for the banister sink. We noticed a strange smell coming from the nouns of the exposed pipe. We went a cut up our vault rug and subfloor to find that there be four other pipes. Currently, one of the holes in that nouns has a backflow tap (with a ping pong ball to stop the wet from coming up the pipe) The other pipe is open and newly to the right of the one hole. We dumped water down into the pipe and the hole and it appears to own stopped the smell, but the water have not run down at all. Is this ordinary?


Answers:    Yes...it's normal...The pipe is suppose to hold a " P-Trap" to hold water, seal sewer gass off contained by the pipe....if it hasn't gone down, it is working properly...good piece you did that....just hold on to water within it until the work is done.
what you did is exactly what a "trap" IS SUPPOSE TO DO IS TO TRAP SEWER GAS FROM COMING BACK UP THE PIPE
If that water dries up you will own the problem again, is best to cap that pipe, making sure that it is not a vent, which is a total new issue
I would guess that the defence the water hasn't gone down is it have filled a p-trap. The purpose for this trap is to stop gasses, but the wet will dry up and the smell will return.
I would cap those pipes as very well. The reason pipes enjoy the trap under the sink is so it holds hose. The water keep the smell out like a plug. If you continue - the smell will come back. If you lose that hose down that won't go down, the smell will come posterior.
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