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Old 08-30-2019, 10:26 PM   #2
Carl n Susan
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Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,370
M.O.C. #4831
That is an anti-siphon valve for the black tank flush.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB

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