What the Heck is this?
In our 2017 3661RL Montana under the bathroom sink there is a white water pipe coming in under the sink but not connected to the sink. This white water pipe goes to a black thing with an arrow pointing flow direction. There is another white water pipe that connects to this black thing and this pipe goes back down and through the floor, nothing connects to the sink or hot/cold water pipes. This black thing is square thing has somewhat of a T connector connected to it, this is where the two white water pipes connect. Anyway, it appears the black thing is leaking, so what is all this? Thanks for everyone's input.
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