Just my thoughts..I see PVC, which tells me it's been up-dated or repaired. should be two tanks going into one outlet. Each tank should have it's own slide valve. You would normally remove a cover, open your BLACK tank first then open the slider for the greay tank. After draining is complete, you shut both sliders and put the cover on.
It appears your has been modified to omit the slider or both sliders. Not good, in my opinion.
Tree
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Treeclimber
2703 Tow Lite
2002 Escalade
Bonita Springs, Fl. &
Andrews, NC
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