How can we properly install a bathroom sink drain for an under mount sink without needing to hire a plumber, as my husband is inexperienced and feeling overwhelmed by the task?
Asked by Wade Ellis 
3 weeks ago
Last Updated: October 30, 2024
So, how can we go about installing this bathroom sink drain correctly without needing to call in a plumber? My husband is a bit clueless since he’s never tried this before. We have all the parts from the old drain for a drop-in sink, but now we’re switching to an undermount sink.
Just trim a bit of the trap arm and align it. It might end up being around 4 inches, I believe. Also, the gasket under the sink seems loose.
The trap swings 2 inches, no more. They should make sure it reaches the tailpiece.
Seriously. When you check out the photos, you’ll see it swinging beyond the tailpiece.
Come on tough guy. You think you’re so clever. From my years of experience in the field, I can tell you that the trap, the actual p-trap, can be adjusted to make the connection without cutting anything. Why create more work for homeowners?
Furthermore, if they truly wanted to, they could simply loosen the slip nut on the trap adapter and move the trap arm back a few inches without the need to cut anything.
Because when you look at the picture, you can see that it’s positioned way beyond where it should be. Most likely, they’ve shoved it into the trap adapter until it wouldn’t go any further. To line it up properly, it needs to be shorter. You’re the one who initiated this conversation with me. You said NO, and then added some nonsense.
In order to achieve that, , the length needs to be shorter.
Check out a YouTube video, these installations are pretty straightforward.
Head over to Home Depot and browse the plumbing section to grab a flexible plastic trap. It’s a reliable option.
Definitely not, those are the absolute worst.
Oh man, that’s a risky move, like smoking while handling gasoline. It might work occasionally, but then kaboom! Flex hoses are only for those who use flex seal. It’s no good.
Yeah, they might be subpar, but at least he can troubleshoot to determine if he needs to hire a plumber to do it properly. The plumber I contacted quoted $750 for each fixture, whether it’s connecting a toilet, a shower, or a bathroom sink… I told him he was out of his mind, haha.
How long did it take you to complete the task?
Sometimes the part that goes into the wall can slide in a little further. I had this problem with mine and needed more pipe coming out of the wall. The plumber who installed it anticipated this, so I was able to pull more out.
Simply attach the slip nut and position the trap under the tailpiece to complete the setup.
No, . That drain is not aligned properly. They should connect the tubular to the tailpiece first.
Is right. The trap should be positioned under the tailpiece before connecting them.
Purchase a new p-trap and 1 1/2-inch pipe; the old 1 3/8-inch one is no longer in use.
Mentioned it’s 1 1/2.
For the next time, try using a 1 1/2” schedule 40 45 and attaching a small piece of schedule 40 1 1/2” pipe before adding your trap adapter. You’ll need a tubular 45 in your situation.
So, upon further inspection, you might want to try moving the trap over to the tailpiece (the brass tube hanging down from the sink). Before doing so, make sure to slide your slip nut onto the brass, then place one of the blue gaskets that came with the trap. Ensure the tapered part is facing downward, and tighten everything up. To check for leaks, plug your sink with the pop-up and fill it with water. Release the pop-up once the sink is full. In the industry, we refer to this as a dump test. Just a heads up, if the trap isn’t properly seated where it connects to the trap arm, it may leak. If that happens, simply adjust the trap until it sits correctly. Be sure to test it out before considering the job done.
You’ll need an adapter because the big pipe won’t fit the small pipe.
When you’re installing it, start by removing the U-shaped pipe and attaching it to the brass pipe. Remember to put the nut on first, followed by the flange before screwing it onto the U-shaped pipe. If the flange is too big for the brass pipe, there could be a second flange in the package to help adapt it.
Trim the jbend to line it up more accurately.
If you’re having trouble, don’t hesitate to call a plumber. Better safe than sorry!
You might want to consider calling a plumber. It’s not worth the risk.
YouTube
Treat this as a learning opportunity. Hire a plumber and observe how they make the connection. ‘t hesitate to ask questions and compensate the plumber for their time. This process should be quick, but if you encounter difficulties, it may require additional assistance. It’s okay to observe and learn from a skilled professional. Best of luck