Thread: Any idea what this is

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.

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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.

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?

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

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

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

Originally Posted by John Arnold

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.

Originally Posted by Gunnar Alquist

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.

Originally Posted by william siegel

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?

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."

And another post:

anyone know what this is - Home Inspection & Home Inspector Services For Inspections and Inspectors

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

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

Originally Posted by Jerry Peck

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

Jerry - In a way, you beat yourself to it, by answering the same question nearly a year ago!

John,

That was the reason for the ...