Backflow preventor?!

[Colobasement]

We are in the process of finishing our basement ourselves. In the handouts provided by our city, per our code, it says that backflow protection on basement fixtures is required and accessible at finals. What does this mean?! Is there a special fitting that gets installed before the shutoff valve?

Or was this already installed on our house that was built in 2003 that services all of our house?

Thank you greatly!

 

[hj]

They are referring to a "drain line" backflow valve, NOT water lines. This is a feeble attempt to prevent flooding in the event of a main line backup.

 

[Sponsor]

 

[houndzilla]

They are referring to a "drain line" backflow valve, NOT water lines. This is a feeble attempt to prevent flooding in the event of a main line backup.

wouldn't this only be necessary if there aren't overhead sewers?

Coloradobasement, what is the plumbing setup in your basement? Are drain in the basement gravity drains, or piped to pit where an ejector pump removes them?