It's a common factory shortcut to do something like that. If its easier to run the drain from a sink or shower to black instead of gray, they may do it. Changing it after the coach is finished is often a challenge, simply to get at everything. The plumbing itself is easy, if you can see it and touch it.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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