In the realm of second homeowner woes, I had a P-Trap assembly under the bathroom sink. It was a strait connection to the pipe connected to the main sewer line. (least I think that was the case) either way it was not vented and it worked just fine. But after dealing with a clog the corroded botom of the P-Trap (which was made of chrome plated metal) broke and left a 1/2 inch long hole in it.
Suffice it to say, I had to replace the entire assembly. And as with most projects it not just one piece that needs replacing. I replaced the sink flange and tail pipe and the P-Trap now made of plastic.
As you can see in the image above that I used the original back plastic pipe leading down the wall.
When water drains now it backs up and eventually gurgles. Also when it backs up it leaks where the tail pipe and the P-Trap meet. My research tells me this is because this assembly is not properly vented. Is this true?
I ask only because the former assembly did not have venting problems. Is it possible that the former parts were venting through bad seals?
When does an under the sink P-Trap assembly need venting?