ok, i figured out the fittings. The RO tank has a 1/4" male thread. Is this going to be too small to supply 2 faucets, a shower and a toilet? I can pickup the 2 gallon expansion tank for $40 and it has a 3/4' male thread opening.
I added flexible hoses to the pump and put some foam below it. If it gets any quieter, I won't know that it's on. what a difference.
i took some pictures.