I've only seen the airgap criteria on a drinking water unit but the system is the same so why they wouldn't tell you that,:neutral: at least from a contamination point of view is beyond me

as long as the drain line water is "falling" into the drain you're ok. sink ,floor drain etc.min 1 inch.

I don't feel like you hijacked the thread at all. This all helps. If I don't do it with a new unit while living here I will be putting it to use when we move. (hopefully by summertime)

If you need help or plumbing parts let me know,I Install these things almost daily:biggrin:

Get a saddle valve with a valve on it. It doesn't look like that one from BRS has a on/off valve on it.
Even if you have a ball valve to shut off to the RO unit, if something happens u want to be able to shut the source off.
Also don't tighten the saddle valve too much. I crimped my pipe a bit cause i couldn't see it was squeezing so hard and I have a bad habit of over torquing things.




EDIT: Ignore the first 2 lines lol. didn't read that was a DRAIN saddle valve. was wondering how it pierced the pipe.