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Darrel, I suspect you have three tanks on your RV, one 28 gallon black tank and two 28 gallon grey tanks. It is imperative that you find the dump valve for your second grey tank and then proceed from there.
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Jim in Memphis, Wife of 51 years is Brenda
2019 F450 6.7 Powerstroke
2018 Mobile Suites 40RSSA
2021 40' Jayco Eagle
2001 Road king w/matching Harley sidecar
2021 Yamaha X2 Wolverine 1000
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