Need to replumb under sink for new disposal

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by rsmith99, Nov 2, 2012.

  1. rsmith99

    rsmith99 Member

    Feb 28, 2008
    I am replacing the disposal under my kitchen sink. The new disposal is a littl bigger than the old one and the pipes need to move a little.

    The existing drain pipes are 1 1/2" PVC. All glued together.

    When I was at the plumbing supply store buying new PVC fittings, a plumber suggested I replace all the 1 1/2" PVC with the smaller, thinner, slip joint fittings to make it easier next time.

    I like the idea of easier next time, but it seems it would be better for the sink and the disposal if I kept the drain diameter 1 1/2".

    Can I get some opinions on which way to go?

  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    Another plumber for the thinner PVC with slip joints. It makes it easy to take apart if you need to clean it out too.
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  4. kreemoweet

    kreemoweet Member

    Sep 7, 2009
    Seattle. WA
    The thinner tubular drain pieces are not significantly smaller than PVC in the inside diameter. Unless you have some special need
    for the added sturdiness of Schedule 40 PVC, the 1 1/2 in. tubular is the way to go, the flimsier stuff is perfectly adequate
    for the job it needs to do, and much more convenient.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    I have ONLY used the glued together drain fittings in VERY special circumstances. Otherwise everything is done with 1 1/2" tubular.
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