My coach has the same set up. I had to replace the clear hose as mine too was stained. Available at hardware store. When the electronic monitor system doesn't work right the sight glass lets you know exactly how full your gray/black tank is. I just got through washing out my tank for the season. Just hook a hose up, open the valve and flush away. Don't forget the hose is on as you will flood your coach once the tank is full.
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Steve
Newell
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