How far down should bush be inserted into shower drain

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Kimster, Oct 31, 2011.

  1. Kimster

    Kimster New Member

    Messages:
    87
    Location:
    Manitoba
    Hi everyone,

    I'm ready to install my shower drain kit and I have to either bush down from 2" to 1 1/2" inside the drain or use a 1 1/2" gasket rather than the 2" that comes with the kit. Our code specifies that you can use a 1 1/2" drain if there's only one shower head and I can't replace the 1 1/2 with 2 because of where the vent stack is so I have to transition.

    I'm finding the 1 1/2" rubber gasket to be very difficult to compress and I don't know if I'll get a good seal on the drain with it. In any case, where should the pipe (or reducer bush) come up to on the gasket in the drain? Should it be flush with the top of it like this:

    DSC_0927.jpg

    or should it be a little ways down (3/8") like this:

    DSC_0926.jpg

    I will be using silicone under the rim of the drain but I've also read here that you should put some inside the drain for extra insurance. Does that mean I should seal all gaps with silicone (between gasket and pipe and between compression ring and body)?

    Thanks again in advance,
    Kim
  2. ballvalve

    ballvalve General Engineering Contractor

    Messages:
    3,261
    Location:
    northfork, california
    If your bush reaches the drain, you need immediate attention at the depilitory shop. :)
  3. Kimster

    Kimster New Member

    Messages:
    87
    Location:
    Manitoba
    LMAO!

    OK, I guess I asked for that, ballvalve. Any thought on the real issue at hand?
  4. Chad Schloss

    Chad Schloss Member

    Messages:
    329
    Location:
    USA
    bwahahahah :) NICE! lol :)
  5. Jerome2877

    Jerome2877 In the Trades

    Messages:
    397
    Location:
    BC
    I use the glued shower drains, those gaskets will fail eventually. Then all it takes is a glued bushing underneath to do the transition.
  6. Kimster

    Kimster New Member

    Messages:
    87
    Location:
    Manitoba
    OK, so I won't be using the glued drain because I like to be able to disassemble things if I need to (I prefer using screws rather than nails if I can, floating floors rather than glue-down, etc.)

    Can anyone with experience with this type of assembly actually answer the question?

    TIA
  7. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,974
    Location:
    NW Ontario, Canada
    Around here the bush is where I send the dog to do her business.

    I've only ever worked with 2" shower drains and I use the type with the compression gland. I do put a film of silicone seal under the lip where it meets the pan but nowhere else. I just use a tiny bit of soap and water to wet the rubber gland to lubricate it.

    I cut the pipe just short enough so that it doesn't interfere with the metal tool used to tighten the gland nut.
  8. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,631
    Location:
    Cave Creek, Arizona
    If you use silicone to seal the drain, you do NOT have to be worried about 'disassembling" it some day, because you will have to chop it loose anyway. The pipe normally extends just below the strainer, so it does not interfere with it, and then the "bush/bushing" slides over it. It is normally long enough so it reaches the bottom of the drain with just a small amount of pipe projecting out of it.
  9. Kimster

    Kimster New Member

    Messages:
    87
    Location:
    Manitoba
    Thank you, hj.
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