Reject water drain line installation system and apparatus for under sink reverse osmosis filter system

In a household under counter reverse osmosis water filtration installation associated with an in-counter sink having a garbage disposer suspended therefrom and in drainage communication therewith, the garbage disposer having an outlet connected by a standard slip joint fit plumbing fittings to a sink drain trap plumbed to a household sewer system, and which said filtration installation includes a reject waste water bypass conduit means operable for flushing waste water from said filtration installation into an under counter waste water drain line tube, the improvement in combination therewith a waste water drainage system for coupling an outlet end of the waste water drain line tube into the sink drain trap in parallel drainage relation with the said standard slip joint coupling fittings, said improvement comprising:

• a baffle Tee plumbing fitting having first and second inlets including respective flow axes oriented generally perpendicularly to one another and having respective inlet flows initially separated by an internal baffle, the baffle Tee fitting having a common slip joint outlet in communication with the baffle Tee first and second inlets and located downstream of the baffle and including a flow axis oriented generally parallel to one of said flow axes of the baffle Tee first and second inlets,
• a standard slip joint single conduit plumbing fitting having an inlet end and an outlet slip end with the single conduit plumbing fitting inlet end being coupled to the garbage disposer outlet and the single conduit plumbing fitting outlet end slip coupled to the baffle Tee first inlet via a slip joint nut and washer of the first Tee inlet, the baffle Tee outlet being slip coupled to an inlet of said sink drain trap via a slip joint nut and washer of the drain trap inlet, and waste water conduit means operably coupled to the baffle Tee second inlet and to said waste water drain line tube, said waste water conduit means comprising a drain adapter means including an inlet serially connected to said waste water drain line tube, slip joint plumbing fitting coupling means operably connecting an outlet of said adapter means with the baffle Tee second inlet, said adapter means further including closure means operably associated with said plumbing fitting coupling means for operably sealably closing said second inlet of said baffle Tee plumbing fitting to thereby provide a sealed waste water drain passageway from said waste water drain line tube into the baffle Tee plumbing fitting second inlet via said adapter means, said adapter means comprising
• a hollow tubular skirt having a longitudinal axis and being open at a first axial end thereof to form said outlet of said adapter means,
• an interior generally concave dome having a wide end connected to a second axial end of said skirt axially opposite the first end of said skirt, said dome converging to an apex area spaced axially remote form the skirt second end, the adapter means inlet comprising a tubular protuberance projecting from the exterior apex area of said dome and having a through passageway having a longitudinal axis oriented transverse to said longitudinal axis of said skirt, the protuberance passageway having inlet connector means for sealably receiving an outlet end of said waste water drain line tube, said through passageway having an outlet opening generally to an interior apex area of said dome, said skirt having at least a cylindrical slip fit portion thereof adjacent said first axial end of said skirt diametrically sized for and installed with a slip fit into an inlet of a given slip joint Tee plumbing fitting selected from the group consisting of the second inlet of said baffle Tee plumbing fitting and an inlet of a three-way slip joint plumbing fitting disposed in said slip joint plumbing fitting coupling means upstream of the baffle Tee second inlet, said skirt and said dome together defining said closure means of said adapter means, said slip joint plumbing fitting coupling means comprising an annular seal member encircling said slip fit portion of said skirt, a seal support surface on an interior of the inlet of said given slip joint Tee plumbing fitting, and a slip joint nut threadably engaged with an exterior of the inlet of said given slip joint Tee plumbing fitting for compressing said seal member against both the seal support surface and an exterior of said slip fit portion of said skirt.