Is this a discharge line?

[MaxPower]

Hello,

I am installing an RO system. The instructions suggest drilling a hole into the drain and running the drain tube into the drain pipe. The house was built about 3 years ago; there is a garbage disposal.

However, I noticed this blue pipe and am thinking this is a discharge line for RO systems. Rather than drill the hole into the drain pipe, and hear the water trickle, I can just attach the drain tube into the discharge line?

I can't think what else this can be, other than some type of venting pipe?

The pipe is on the left of the cold water supply.

Thanks,
Max

 

[phishfood]

I can't exactly be sure from the picture, but my guess is that the blue pipe is flexible electrical conduit. Is it corrugated?

Also, while I do not have experience with RO systems, I would be very hesitant to directly connect one to the drainage system. I would think that it should discharge through an air gap.

 

[MaxPower]

Thanks for the response, phishfood. It is not corrugated, more like 1" cpvc. The air gap is connected via the RO faucet and discharges through the drain. I probably will knock on a neighbor's door, since these are condos and built by the same builder.

 

[johnjh2o]

I don't think I would use it not knowing what it's for or where it's going. You should have a fitting with the RO unit that clamps onto the tubular waste pipe for the sink, that requires you to drill a hole in the line. Just be sure you do it on the sink side of the trap.

John

P.S. this is the same response I gave you on another plumbing forum.