For the drain I got the 1-1/2" "Y" fitting and a reducer that gets me from 1-1/2" down to 1/2" but again thats as small as I can go with fittings from my HD. They had nothing to go any smaller. I think I may have a 1/2" to 3/8" on an old Ozone Reactor I built but that doesn't do much since the waste water line on the RO unit is 1/4" OD.
Jeez...I though this would be a snap. The only reason I am in any hurry is that I have no more RO water in my top off and I am watching the sump water go down more and more by the hour
Gonna have to use dechloronized tap water tonight I guess.