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Thread: Replace chrome trap arm under kitchen sink

  1. #1
    DIY Junior Member bl2003's Avatar
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    Default Replace chrome trap arm under kitchen sink

    Hi all,
    I started replacing kitchen sink plumbing and stuck, because I am not sure how to remove the trap arm to replace it with PVC part.
    Looks like it is either soldered or glued into some kind of fitting inside the elbow. At the wall side the elbow seems to be screwed into the waste pipe.
    Please advice.
    Thanks!
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    Last edited by bl2003; 08-07-2011 at 02:23 PM.

  2. #2
    In the Trades Tom Sawyer's Avatar
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    It's soldered into a threaded bushing. You will need to cut the chrome off flush with the bushing and then make a couple of horizontal cut through the bushing and peel it out with a chisel.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    You should be able to unscrew that fitting from the portion sticking out of the wall. It is preferable to only use male plastic threaded fittings, because if you get it too tight with a female, it may end up splitting down the road (if it doesn't happen right away). With a male plastic bit, the metal female helps prevent it from splitting. It is possible that the nipple through the wall may unscrew from the fitting behind. This normally isn't catastrophic, but you'd need to clean it off and then put pipe dope or teflon tape on it before screwing it back in. That looks like concrete, so if it is, it probably won't budge when removing the coupling from the threaded nipple.

    Normally you'd screw on a Desanko (it is called other things in various parts of the country, and then the tubular trap arm would slide into it, you then tighten up the compression nut on the Desanko, and you're done. WIthout seeing the whole shebang, it's hard to tell if you need that 22-degree offset or can just use a straight fitting.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    In the Trades Tom Sawyer's Avatar
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    I would lay money that there ain't no way that brass bushing is unscrewing from that cast, but it might. Stranger things have happened. They just never seem to happen to me.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  5. #5
    Consultant cwhyu2's Avatar
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    I have never unscrewed a trap solder bushing,Because the tubular pipe will crush when you put pliers to it.
    I cut them out like the above posters and install a trap adapter.

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    One side is soldered, you won't get that out...the other end is threaded onto the nipple...that should unscrew. Now, it's possible that the solder made it into the threads of the back part, then, all bets are off. That nipple may screw out of the fitting behind it, and if required, you could install a new one if you can't get that fitting off.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  7. #7
    DIY Junior Member bl2003's Avatar
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    Thanks for your suggestion. I didn't yet try to remove the bushing, because I couldn't find brass Desanko in the big box store.
    I'll check a smaller (and better!) plumbing shop on Monday or Tuesday.
    http://www.watts.com/pages/_products...s.asp?pid=2789 - Is that the right item?

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    In the Trades Tom Sawyer's Avatar
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    You won't, screw a pvc male adapter in.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  9. #9
    Moderator & Master Plumber hj's Avatar
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    quote; You should be able to unscrew that fitting from the portion sticking out of the wall.

    That will be the day. In 60+ years I have NEVER been able to unscrew one. They ALWAYS have to be cut out.
    Licensed residential and commercial plumber

  10. #10
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Quote Originally Posted by jadnashua View Post
    One side is soldered, you won't get that out...the other end is threaded onto the nipple...that should unscrew. Now, it's possible that the solder made it into the threads of the back part, then, all bets are off. That nipple may screw out of the fitting behind it, and if required, you could install a new one if you can't get that fitting off.
    The way they were installed was to solder the bushing onto the trap before screwing it in. There should be no solder behind the bushing. But in most cases it will have to be cut out.

    John

  11. #11
    In the Trades Tom Sawyer's Avatar
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    I'm with HJ, not yet 60 years but close to 40. It ain't coming unscrewed for me I guaranteeeeeeeeeee
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  12. #12
    Retired Defense Industry Engineer jadnashua's Avatar
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    So, what you are saying is that the fitting screwed onto the nipple coming out of the wall won't budge? If so, I'd guess it would take some careful cutting to not ruin the threads.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  13. #13
    In the Trades Tom Sawyer's Avatar
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    It does but it's brass so it peels out without much trouble.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  14. #14
    Moderator & Master Plumber hj's Avatar
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    The key to removing it is that you have to remove ALL of the tubing first.
    Licensed residential and commercial plumber

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