Yo - I have an RO unit. Mine came with the equipment to mount it to the inside wall of the cabinet under the sink. I would have had to purchase the hardware myself to "T" it in to the pipes under the sink. But it came with a neat attachment for the faucet. I had to get a special faucet attachment, but it only cost $2, so that is cool. Now I just grab the RO unit, set it on the counter and snap the hose to the fauce and turn it on. Easy as pie. I'll never go back to sucky water.