I live in a 32 year old home and in the process of replacing the paneling on the wall of the kitchen I came across a pipe I am unable to identify.

The wall is where the water is provided for the ice maker. From the foundation, there is a primary copper pipe that Ts off and connects two other copper pipes which return back into the foundation. The primary copper pipe continues on and then is T'ed to provide a pipe to attach tubing for the icemaker. In essence, there a total of three copper pipes which are coming from the foundation.

Directly adjacent to the main copper pipe is a one inch PVC pipe also coming from the foundation for a length of about 6 inches. For whatever reason, the PVC pipe and the primary copper pipe were duct taped together.

What is the purpose of this PVC pipe coming from the foundation.

It would help if you had told us what room the pipes are in. The PVC pipe sounds like it was installed for a drain. Could be a AC condensate drain, a water heater pan drain or a washer pan drain. The copper pipes are how we make connections above the slab instead of under it. Regards, Toim

These pipes are in one of the walls of the kitchen. The refrigerator backs up to the wall and that is where we connect to the water supply for the ice maker.
Can I assume that I shouldn't mess with the one (1) inch PVC pipe. Just leave it open like it is inside the wall.
What would happen if I capped it off?

Thanks

What would happen if I capped it off?
Nothing, although I would be interested in tracking down where it terminates.
Regards, Tom