Why is a newly installed sink drain leaking above the trap?

“I just noticed this was leaking, and I’m not sure how to reconnect it, or if there is a specific product that can close and seal this gap.”source ↗

“I’ve tried loosening the ring at the top of the trap and tightening it around the sink drain, but it doesn’t hold.”source ↗

“I’m not experienced in any plumbing. I’m afraid to DIY it. Should I attempt it? If I ask a plumber to do it will they have to replace the whole piece holding it also?”source ↗

“I will have to google some of what you said because I’m completely uneducated in this field and a first time home buyer lol I thank you for your extensive advice.”source ↗

“I did try that and I tightened it as much as I could, unfortunately it was not successful 😞”source ↗

“Can you please explain what a pop up drain is? Sorry I’m uneducated. If possible provide a link to a DIY video? Would you recommend I do it? I have done a few DIY home items just never plumbing.”source ↗

“It's not leaking because of the Bizzaro trap... it's leaking from the tailpiece threaded connection.”source ↗

“There's a leak under my kitchen sink when draining a full basin or running the dishwasher. I've had a number of unexpected expenses lately and I'd like to fix this myself rather than hiring someone.”source ↗

“Could someone walk me through exactly what parts I'm gonna need to buy and how to replace them?”source ↗

“I know very little about plumbing except I really don't want to do it.”source ↗

“Recently remodeled the kitchen, a "kind of" plumber told me this is wrong. There shouldnt be 2 p-traps and the rubber Y shouldnt be there... what is wrong here and what should it look like? And worst case what would happen if i leave it lile this”source ↗

“Ok gotcha but other than maybe not being up to code, is there anything that can happen down the road if i leave it?”source ↗

“At first, the drain was draining away very slowly and I thought it was a blockage.”source ↗

“now it refuses to drain at all.”source ↗

“My brother just got this new sink/vanity installed and it’s leaking from the drain above the trap.”source ↗

“Water damage on the new vanity.”source ↗

“I need to replace the middle two pipes(the two pipes above the copper p trap), the rubber gaskets are very old and the pipes are leaking.”source ↗

“Should I just replace the gaskets with new ones and new pvc washers?”source ↗

“What are my DIY options?”source ↗

“I think i need books and plumbing 101”source ↗

“Can anyone tell me what I’m going to need to replace all of this, it’s a mess and it’s leaking.”source ↗

“I had wanted to remove the p-trap before to get everything unclogged, but I got confused and gave up.”source ↗

“Problem started a few days ago leak has not increased just leaking small amounts while the water in the sinn takes a long time to drain. What can I do??”source ↗

“This is my horizontal waste arm coming from my kitchen sink, and attaching to the vertical stack (which seems to be copper but painted...) - the stack then connects to cast iron at the bottom to go through the foundation.”source ↗

“The arrow is where it leaks and drips down to the cast iron section, which I assume has been happening for some time since the cast has outside rust and is/was behind a wall before we demo'd.”source ↗

“The leak is barely if at all apparent when running water, but as soon as I dump a volume of water into the sink (stock pot, or just fill the sink and drain), the leak becomes more obvious and wets the floor.”source ↗

“Its a sweat joint. And its leaking ‘cause its old.”source ↗

“I want to use the faucet’s drain assembly instead of the one that came with the sink. However, this o-ring doesnt seem thick enough for this seal at the top to be sealed?”source ↗

“The one on the top looks too thin, but its not leaking and I have the same ones Im using for years.”source ↗

“Just installed a new p trap and tailpiece extension in our bathroom yesterday, which unfortunately ended up leaking at the highlighted connection shortly after.”source ↗

“only to come back to another smaller leak much later.”source ↗

“P trap was reversed to compensate. Now it leaks.”source ↗

“I just want to determine possible cause and if it’s our fault then we’d be happy to pay for the plumber, or if it is a building defect that the builder could possibly cover under their warranty?”source ↗

“my wife and I bought our first house together and are learning about some of the fun work the previous owners had done.”source ↗

“It also seems that the p traps one nut is stuck pretty tight on there.”source ↗

“Any suggestions about what I should do and any other concern (there are more concerns of mine but i'm not a plumber) would be greatly appreciated.”source ↗

“That brown stuff is sewer water leaking out off all the crevices, evaporating, and leaving behind nasty grime.”source ↗

“When I took the drain plate off, I noticed what seemed to be a rubber gasket of some kind under it, but it was crumbling apart.”source ↗

“I went to my neighborhood Ace and got a gasket that fit the drain (pictured above) and then screwed it back in. But now when I fill the sink up to scrub some dishes, it does not hold the water.”source ↗

“Can anyone advise me on what I need to make it watertight?”source ↗

“Should I leave that black rubber gasket on? Or does the plumber's putty replace the gasket?”source ↗