If you want it completely drained, have you found your low point drains?
If you take the caps off and open a faucet, any trapped water should drain out of the system.
Half a gallon is a lot of water for a supposedly empty camper's plumbing system.
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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