Backwater valve max slope?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Bob from accounting, Jun 2, 2020.

  1. Bob from accounting

    Bob from accounting Member

    Joined:
    Mar 5, 2020
    Location:
    California
    I am installing a 2" backwater valve on ABS drainage. The crappy kind that is cheap and has the door that hangs over the opening. I could not find anything for 2" ABS other than this? Seems like the ones I was suggested to buy are for 3 and 4". Not sure how bad this one is but I am going to give it a shot.
    There are two areas I can cut into to do the install.
    One is a gradual slope, another area is a steeper slope. Drops about 2" over about 2' (far from vertical, not a problem here)
    My instinct says install this on the slightly steeper horizontally sloped drainage area?
    Is there an ideal horizontal slope these should be installed at? I wonder what is the max slope for horizontal backwater valves? Hope that makes since?
     
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