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  1. #1
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    Apr 2008
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    Default Connecting two 90mm tank overflows into 100mm stormwater

    I have just had a 4000g water tank delivered. The tank comes with two 90mm overflows (to match the two inlets). I was planning on connecting both overflows to a 100mm stormwater run-off pipe instead of having to run two separate 90mm stormwater pipes (about a 20 metre run). Would this size pipe be sufficient to prevent water backup in a storm?

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  3. #2
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    Nov 2007
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    No probs, just remember that most home's stormwater discharge point is 100mm and that covers your whole house!

  4. #3
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    you could cap one of them off, because they are the same height and are made for 2 for different tank positions. so they arent exactly there so both can be used

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