Attaches to any InnoFlue® drain to allow condensates to flow while unique ball valve assures combustion gases remain contained at higher temperatures. Comes with and can be installed with a barbed or compression fitting. Centrotherm Eco Systems InnoFlue® Universal Ball Valve Siphon, For Use With: InnoFlue® Polypropylene Vent Systems, Polypropylene, 6-1/2 in H, Domestic