I had that surprise the first (actually second) time I used the RV!! I hook up the sewer end of the hose before attempting to attach the hose to the coach, so I caught the nasty when I unscrewed end cap. Thorough flushing the black tank before leaving has prevented a repeat.
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2019 20th Anniversary Edition 3120RL
2019 3500 Silverado HC, SWR, Duramax
B&W 20K for GM OEM Puck
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