backflow preventer

[Madmike]

Hi Everyone

I need some quick help if possible. I am trying to plumb a floor drain and sink in my bonus room that is in the rear of my townhome. When they were built, there was a slight grade at the back of the house, so there is a aprox 5-6 foot tall crawlspace under the floor. The room is behind the garage and main foundation wall. I went under to see if there were any plumbing pipes I could connect to and all I found was this...

I looked up the fitting and it looks like it is a backflow preventer... but it isn't hooked to anything. Does this pipe go to the main sewer and can I plumb into it?

Thanks!
Mike

 

[mikec]

Ive only seen backflow preventers on feeds. Which would mean that they are feeding the house with water. Not to drain. But thats only what i hsve seen

 

[jtink]

It is a back water valve. It allows drain flow through it but if the sewer backs up it will stop it from coming out of the fixture it is serving.

 

[johnjh2o]

That is what it is and what it's designed to do but it's not connected to anything. Before I connected anything to that line I would make sure of where it is going, and if will take the water your require it to.

John

 

[jtink]

That is what it is and what it's designed to do but it's not connected to anything. Before I connected anything to that line I would make sure of where it is going, and if will take the water your require it to.

John

Agree. You could have a local plumber camera and locate the line for you.

 

[Madmike]

I agree, it was weird that it wasn't connected to anything. I put a 90 degree elbow on the unconnected end and ran water down it for a little while and it is draining fine.... I guess the builder had anticipated that someone would eventually want sewer on that side of the foundation wall

Thanks for all of the replies!