Any idea what this is

[william siegel]

The water was off to this house today. I have no idea where this pipe is going to. It is connected to the second story master bathroom sink drain and runs into the wall.

[Randy Navarro]

It is an air admittance valve. Installed usually where there's no access to the wall to vent to the exterior.

They're ok unless specifically prohibited in your jurisdiction.

[Jim Robinson]

Do you mean the copper line is connected to the sink drain line? Maybe some type of condensate drain line connected to a pump. Was there a condensate pump at the air handler in the garage, or is this a different house?

[John Arnold]

William - You're talking about the line coming off the tailpiece, right?

[John Arnold]

Looks like a device to keep a trap (somewhere else) wet. Can't think of the term at the moment.

[Gunnar Alquist]

Whatever it is, it looks like it was installed upside-down.

[william siegel]

William - You're talking about the line coming off the tailpiece, right?

That is correct.

This is an upstairs bathroom on an outside wall.

There is no condensate pump at the air handler.

[william siegel]

Whatever it is, it looks like it was installed upside-down.


I'm confused by this one (but that is just a normal state of mind). Everytime the water in the sink is run, that water has to be going somewhere.

[John Arnold]

That is correct.

This is an upstairs bathroom on an outside wall.

There is no condensate pump at the air handler.
This reminds me of a past post - it could be a way of diverting a little water to another trap every time water drains in the sink in the photo. It could be for a little-used trap - to keep it from drying out. Was there anything like that in the house?

[John Arnold]

From a previous Jerry Peck post found in the archives:

"The trap primers I see are the ones which look like dishwasher connections installed upside down.

I occasionally find floor drains in large laundry rooms, especially those with mop slope sinks recessed into the slab. Typically, these are fed from the laundry sink drain."

[John Arnold]

And another post:

anyone know what this is - Home Inspection & Home Inspector Services For Inspections and Inspectors (http://www.inspectionnews.com/ubb/Forum11/HTML/001212.html)

[Matthew Barnicle]

I am going to guess a trap primer also. Possibly to keep a floor drain trap filled?

[Jerry Peck]

Everyone already beat me to it -- it is a trap primer. :D

[John Arnold]

Everyone already beat me to it -- it is a trap primer. :D
Jerry - In a way, you beat yourself to it, by answering the same question nearly a year ago!

[Jerry Peck]

John,

That was the reason for the ... :D

:D