I plumbed a T into the outlet of my FX5 with a ball valve on each point. The perpendicular line in the T closed and the other two open, normal flow. Inlet of the T open and perpendicular of the T open, outlet of the T closed; I can hook up a hose and drain the tank. Inlet of the T closed, perpendicular open and outlet open, hook up the hose to the perpendicular and the sink, and I fill up my tank through the filter's outlet hose. All I have to do is hook up a hose to my filter and I have all of these modular options. It's wonderful.