Valterra Twist-On Waste Valve, Mess-Free Waste Valve for RV's, Campers, Trailers https://www.amazon.com/dp/B000BGHYJS...ing=UTF8&psc=1
I use this, I don't think you would ever get the last drop.
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Rick and Theresa
2017 Montana 3160RL
2020 Chevrolet 3500HD, Duramax
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