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I had dripping gray water from the elbow under the belly this past weekend. We filled the tank to about 2" of water in the shower. I drained the tank, and after the water drained from the belly, the leakage stopped. Hmmmmmmm. So today, I filled the gray tank to almost full, and there was no leakage. As I suspected, the tanks have a vacuum breaker - probably just a hose connected to the top of the tanks, so the gray water was overflowing through that. I have probably overflowed the gray tank before, but just haven't noticed it.
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