Reject water drain line installation system and apparatus for under sink

Abstract

A method, system and adapter couplings for draining the reject bypassed waste water from a reverse osmosis (R/O) filtration unit to a sewer line, and particularly adapted for use in a household or commercial undercounter R/O water filtration installation associated with an in-counter sink having a garbage disposer with its outlet connected by standard plumbing fittings to a sink drain trap in turn plumb to the sewer system. The R/O waste water drain line tube is coupled into the sink drain trap in serial drainage relation with the disposer outlet plumbing fittings by a special convertable Y-Tee plumbing fitting having an R/O drain tube inlet branch and a dishwasher drain hose inlet branch oriented at an acute angle to one another with their respective input drainage liquid flows converging at a common hose nipple outlet of the Y-Tee. The garbage disposer dishwasher drain water inlet nipple is coupled by a standard coupling hose and hose clamps to the Y-Tee outlet. The Y-Tee has a push-in type connector in its R/O inlet branch connected to the R/O waste water drain tube outlet. For an installation when no dishwasher is present the R/O branch inlet of the adapter coupling is severed therefrom and thereby becomes a straight-in coupling fitting for hose and hose clamp coupling thereof to the disposer inlet nipple.