Connecting cellar drain to septic line

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by James23912, Sep 8, 2020.

  1. James23912

    James23912 Member

    May 16, 2020
    Hi I am needing to connect my horizontal 3” line in the cellar to the 4” line going thru the foundation to the septic tank. The 3” stops about 30” from the wall and the exit hole is about 40” lower than the 3”, I Have laid out a diagonal line already , going at an angle, but want to ask if that is the best way as opposed to extending the 3” straight and then dropping down directly vertical using an 90 or sweep , thanks
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Feb 6, 2011
    NW Ontario, Canada
    Is this new construction or a reno? Does the 4 inch line have a clean-out? If not, I would place a Y with clean-out on the end of the 4 inch and feed the 3 inch into the Y rolling them if need be. I would not use a 90 but rather an angle that will match the Y.
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  4. Tuttles Revenge

    Tuttles Revenge In the Trades

    Oct 15, 2014
    Plumbing fittings that connect a vertical drain to a horizontal drain need to come together in a 45 as LLigetfa mentioned. Transitioning from vertical to horizontal requires long sweep fittings so that the change of direction of the waste is more gradual. A long sweep 90 or 2 - 45's creates this transition.
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