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 Urinal back flowing
Author: mccausla (NC)

I have two urinals side by side. When urinal on left is flushed it drains fine. When urinal on right is flushed a small amount of water backs up into the urinal on the left. From what I can tell both urinals and two sinks share the piping in the wall. The building has two floors and I have the same problem on both floors. Any ideas?

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 Re: Urinal back flowing
Author: hj (AZ)

In that case, I assume it is a fairly new installation and the piping was done the "easiest way", not the best way. If done the best way, and to code, the urinals AND sinks would have individual drains so this could not happen. Urinals are NOT supposed to share their drains with other fixtures.

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 Re: Urinal back flowing
Author: mccausla (NC)

1960s Building with original plumbing. I am just guessing on the plumbing lay out behind the wall. May be separate drain for urinals and sink but looks like shared.

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 Re: Urinal back flowing
Author: Wheelchair (IL)

Urinals can share the same horizontal line 2" inch and there should be a clean out access before it hits the main vertical. Because of the age, you could have mineral issues or debris in one urinal. A plumber and cable, plus time should be able to clear and clean the line.

Best Wishes

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