This is just left over in the pipe after you dump. When you drive down the road it finds its way to the cap to SURPRISE you when you take the cap off.
Buy a Valterra twist on waste valve. This helps prevent surprises 
https://www.walmart.com/ip/Valterra-...Valve/55356052
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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