There are two 2" black pipes stubbed out of the wall in my garage. There used to be a water softener here that I think was hooked up to the top piipe via the garden hose sticking out of it (see attached photo). Are these drain pipes? I want to install an ice maker and need a drain and hoping I can just tie into these. Also, can I use the old pipes that were connected to the water softener as the water source for the ice maker?