Installing P trap for the first time..chrome or plastic?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Andrew21, Aug 23, 2008.

  1. Andrew21

    Andrew21 Member

    Messages:
    163
    Location:
    New York
    Hey all,
    Just got my undermount sink in and now I need to hook everything up to the sink (faucet, p trap, etc). This is the first time I will ever do something like this and I'm not that clueless but somewhat lost.

    Should I use the chrome or the plastic piping? I would like a nice look under the sink. I know, I know, nobody really looks under there but I would gather it would look nice. If the plastic is the best and easiest way to do it, I'll go with that.

    Now the drain pipe is coming out 9 inches. WOuld I have to cut this? If putting in the chrome pipe, do I need to solder the connections? Thanks!
    [​IMG]
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Under a cabinet, I don't think appearance is an issue. Plastic probably has an edge in longevity...as in foever, whereas a brass trap will corrode ...eventually.... A brass, or chrome plated, probably has a higher success rate of not leaking at initial install. Plastic can sometimes cause a problem, as you can only tighten the nuts so tight. I usually replace the nylon gaskets with rubber ones, coating them lightly with plumbers grease. These seem to seal up better.


    If you are in MA, or some other states, you will be required to solder the trap arm to your waste stub. If your code allows it, I would cut that stub closer to the wall, solder on a slip joint trap adapter ( sometimes called a Desanko fitting).
  3. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    short of using a rubber fernco which would be savage, a desanko or trap adaptor fitting will have to soldered on.
  4. kingsotall

    kingsotall Plunger/TurdPuncher

    And it's going to take some considerable amount of heat to solder to that copper pipe. Just letting you know...
  5. Andrew21

    Andrew21 Member

    Messages:
    163
    Location:
    New York
    What is a desanko adapter? Is that a copper fitting that when I solder it on, there's a thread at the end? I went to Lowes to get some parts but I didn't know 2 things.

    1. There are different sizes of pipes, 1 1/2, and 1 1/4.
    2. I took out a strainer and started to use the parts to put everything together in the aisle! LOL. As long as I know what to buy, I'll be good. But the last thing is that adapter.
  6. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Do you know how to sweat copper pipe?
  7. Andrew21

    Andrew21 Member

    Messages:
    163
    Location:
    New York
    Yup! Thats not a problem.
  8. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
  9. Andrew21

    Andrew21 Member

    Messages:
    163
    Location:
    New York
    Sweet! Thanks! Let me see if its across the street at HD...i doubt it though.. will report back

    btw, what does DWV mean?
  10. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Drain waste vent.
  11. Andrew21

    Andrew21 Member

    Messages:
    163
    Location:
    New York
    thanks. Of course they didn't have it at HD. Its the worst there. Fittings and stuff all over the place. Time to take a trip to Lowes or the local supply store.

    They did have it in the PVC section though. But I wouldn't know how to connect it to the copper if I did get the piece.

    Thanks Redwood!
    Last edited: Aug 25, 2008
  12. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    PVC is tough to solder!
    The route you're going is better.
  13. Andrew21

    Andrew21 Member

    Messages:
    163
    Location:
    New York
    I know! LOL. anyway, gotta run to the other store. Will keep you posted.
  14. Andrew21

    Andrew21 Member

    Messages:
    163
    Location:
    New York
    Ok, i'm back. Was tied up doing other things but here's my plan. Hopefully I'm doing this correct.

    I'm going to cut the waste pipe closer to the wall to install a 45 degree angle street elbow and then put on the trap adapter fitting as pictured before. Then sweat the fittings on and connect the rest. The sink drain is not aligned behind the waste pipe. Sorry for the angled shot. Here's what I'm up to now..

    [​IMG]

    I just took a picture of this to see if the fittings fit...

    [​IMG]
  15. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Thats one cheapo junko looking basket strainer...
    Well how did the pipes line up?
  16. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,677
    Location:
    Cave Creek, Arizona
    drain

    That is NOT the drain adapter you want, because the trap tubing will probably not slide into it, and it is not designed to accept a slipnut and washer. The one you need WILL come with a nut and washer on it already.
  17. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    Yet another good picture to add to my collection. Thanks Red.
  18. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    I will amend my earlier post and say that at this point a fernco would fit right in.
  19. rombo

    rombo New Member

    Messages:
    62
    Location:
    Ontario
    I don't why you guys are telling him he needs an adapter. Go buy a 1 1/2" rough brass trap, you clean the inside of the pipe sticking out of the wall. Slide your trap arm inside and solder it up.
  20. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    Good call, but you ain't gonna pick that up at the cheepo depot.
Similar Threads: Installing trap
Forum Title Date
Plumbing Forum, Professional & DIY Advice, Tips & Installing a "bottle trap" drain in an older house Sep 30, 2012
Plumbing Forum, Professional & DIY Advice, Tips & Installing pvc p-trap .. how to connect to metal pipe from wall (no threads) May 8, 2011
Plumbing Forum, Professional & DIY Advice, Tips & installing water hammer arrestors May 26, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Installing New Kitchen Sink - Deeper Bowls Mar 27, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Help Installing New Dishwasher Dec 28, 2013

Share This Page