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Thread: Disposer flange and sink basket in cast iron sink

  1. #1

    Default Disposer flange and sink basket in cast iron sink

    Ok, here is a newbie question for you, be gentle !

    Am installing a Kohler cast iron sink, replacing an old stainless sink. Currently, I have an In-sink-erator garbage disposal on one side, regular sink basket drain on the other bowl. I want to keep this same arrangement on the new Kohler sink, but my question is:

    The hole(s) in the bottom of the cast iron sink have a large, curved radius lead-in to the hole. I am just now noticing that the other sainless sinks I am looking at have a rather flat area where the flange seems to mate up with nicely. However, I am noticing that the disposal flange and the Kohler sink basket flange both have quite a right angle underneath the flange, very small radius. This really seems a little strange when I set these in the hole. Am I supposed to be using a special flange for the disposal and basket mounting?

    I have looked high and low for a special flange, no one seems to make one. I can only assume that this means that all the parts out there must work.

    So, I guess load up the underside of the flange with plenty of silicone before installing and completely remove the excess after tightening the nut underneath?

  2. #2
    Master Plumber Redwood's Avatar
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    Actually the only thing you have wrong is loading the flange up with Silicone RTV. Your Kohler cast iron sink is a good one and will probably outlast several disposers. You may want the option of removing the flange and using a nice new shiny one off one of your new disposers at sometime. Despite what the Silicone RTV users claim it does have very strong adhesive properties making removal a bear of a job.

    The cast iron sink is much thicker than a stainless sink and the flange will fit. However, if you are using the Insinkerator style flange with the snap ring I would recommend a second person to push down from the top while securing the ring. It can be a lot of fun to do alone there is very little room left.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    Default Ise

    It can be a lot of fun to do alone there is very little room left.

    That is why I have an ISE snap ring installing tool. It is helpful with stainless steel sinks, but INVALUABLE with cast iron ones.

  4. #4
    Master Plumber Redwood's Avatar
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    That is why I have it too!
    Joe Homeowner DIYer however probably will not have it...

  5. #5
    Moderator & Master Plumber hj's Avatar
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    Default ring

    And by the time he does get it installed, even with a helper, he is going to curse the day his "decision maker" decided she wanted a disposer.

  6. #6

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    Sooo, plumbers putty instead of silicone? I think the instructions with the basket says plumbers putty, but I thought it tended to dry out and crack?

  7. #7
    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    Quote Originally Posted by hj View Post
    That is why I have an ISE snap ring installing tool.
    What? A tool I don't have? I've installed and un-installed ISE disposers on SS, CI, and manufactured stone sinks, and never felt the need for another tool. What am I doing wrong? Or right?

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