We had a black tank valve that wouldn't close, meaning all the liquid would evacuate while leaving the solids...not a good situation. I think it was due to some tissue along with the fact that after 3 years, I was having difficulty closing the valves with the cables - they were getting harder and harder to close, both black and gray, and I'm a pretty big guy!
I replaced both the black and gray valves with new ones and added the Auto-Drain mechanisms so I can operate them with a push of a switch. Some of you may recall I put one in for the galley tank over 3 years ago.
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