Should be a vent pipe running straight from black tank to roof. Gray tanks should have their own vent pipes although I have seen some drawings where a gray tank shares a vent pipe with the black tank. Possible that multiple grays might share a vent pipe I suppose.
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Randi & Shirley
2016 Ford F-350 SRW CCSB 6.7L 4WD
2022 Forest River Vibe 26RK
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