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TC_Z's avatar
TC_Z
Explorer
May 05, 2018

Thetford Toilet Repair U-Cup Seal - Which Way?

Replacing the waste ball in our Thetford toilet. Directions say to put U-cup seal on waste ball and install. But which side is the open side of the U-cup seal supposed to face? Is the open U-cup side to be against the waste ball? Or against the toilet frame?

I checked internet and YouTube, couldn't find this detail.

Thanks once again....
Class A
  • TC_Z's avatar
    TC_Z
    Explorer
    May 05, 2018
    Fantastic, exactly the info I need!

    Wish that info was in the Thetford instructions I have!

    Thanks again!
  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    May 05, 2018
    Per Thetford

    1. Install U-Cup Seal onto key tab side of new Waste Ball. (Tapered side of U-
    Cup Seal faces out.)
    2. Squeeze ends of new Waste Ball together and install into Base, seating the
    Waste Ball in the closed position.
    Note: U-Cup Seal should point toward Pedal side.


    That is about as clear as MUD....but I don't have toilet in front of me nor did I take it about.

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