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Thread: Is water spot size affected by flange diameter?

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  1. #1
    DIY Member chrisexv6's Avatar
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    Oct 2008
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    Default Is water spot size affected by flange diameter?

    Just a question out of curiosity....I see 3"/4" toilet flanges, where you can put the flange inside a 4" or outside a 3".

    Does this affect the size of the water spot in a toilet? (smaller water spot if the 4" piping needs to be refilled instead of 3")

    Does it also affect the flushing "power" (will inside a 4" give you more oomph)?

    Thanks in advance.

    -Chris

  2. #2
    DIY Senior Member gardner's Avatar
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    Default my uneducated opinion

    No. Water spot, flush power -- all that stuff happens before the water exits the toilet at the bottom.

    The effect the flange would have is if the drain were to get plugged up at that point, and then the result would be backup, slow flush -- the usual issues. If the flange opening is wide enough to resist clogs, you're golden.

  3. #3
    Plumber jimbo's Avatar
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    Default

    The water spot is totally ABOVE the weir ( outlet ) of the trap inside the toilet. Nothing about the pipe would affect it. It is totally a design feature of the bowl.

    This is just a guess on my part...and some may disagree: I don't think any toilet would "know the difference" between a 3" pipe and a 4" pipe at it's outlet, since the outlet of the toilet is less than 3", it is flushing into a larger pipe in all cases.

  4. #4
    Master Plumber Redwood's Avatar
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    Default

    Maybe this picture will allow you to understand what determines the depth of the water in the bowl and the subsequent water spot size.


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