SHOULD be gray. I've heard of bathroom sinks draining to black tanks, but showers are almost always gray.
But, why not prove it? Start with empty tanks and then run a couple of minutes of water in the shower. Pull the gray handle. (If you need to catch it, a 5 gallon bucket works and you can then dump it into a house toilet.)
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Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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