The black 1/4" hose is waste water from the RO/DI unit. I think I had to purchase three separate pieces to make this work, actually: the "y" adapter, the valve, and then the piece that connects the 1/4" hosing to the valve. I don't EXACTLY remember
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From a different angle:
This is my unit as it looks right now. Because I'm cheap, I didn't fill the DI canister full of new resin, and so I just tip it...lol. Whatever--I consistently get a TDS of 0 when all is said and done
Note that, in this picture, the "waste water" tubing is yellow, but in the above photos, it's black. I just have them connected together because I didn't have one single piece of 1/4" tubing long enough at the time, and didn't want to make ANOTHER trip to Rona! Same thing applies to the tubing that feeds the unit. In the first two pics, it's clear, and in the above pic, it's white. Again, I used two pieces. I hope this doesn't make things even more complicated.
