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We did the factory tour at the Annual Rally. Looking at the tanks on the shelf some had end drains, some had side drains. If you stop the video at 10:30 mins and zoom in you can see how the plumbing is run between the black tank and grey tank (black tank has 3" pipe fittings). I'm guessing after you drain and flush your black tank and grey tanks you can lower the left side of the rig to drain the pipe so there is no residual liquid.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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