[banditpowdercoat]

I went to the local Plumbing store. Just permanantly mounted my RO yesterday. You may have to ask about the plastic ferrules, most fittings I found came with copper, they had plastic ones in some jars behind counter. I also dont like Saddle valves, especially on plastic main lines. I got a T fitting, that has a similar connection to the RO lines, only larger. Cut pipe, insert T and tighten, was that simple