donnyraybob- Post the year and model of your RV. Each model has different layout for tanks & plumbing.
My 24ST (Rear twin) the drain is alongside the fresh water tank, under the curb side bed. It can be accessed from a panel in the side of the bed frame. Since my drain line is well away from the overflow lines you probably have a different setup...
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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