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Old 11-09-2020, 07:14 AM   #1
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jemison , Alabama
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What does this valve do?

We have a new to us 1996 airstream classic and when I checked my manual about the black tank flush it mentions this valve under the bathroom sink but doesn't really explain what I should do with it. Thanks in advance for your help.
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Old 11-09-2020, 07:31 AM   #2
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It looks like a vacuum breaker.
If it is, there is nothing for you to do.
Its a valve that lets air into a place that might hold water because a vacuum is created (usually the tank flush)

If you can look at the printing on the cap it will tell you what it is.
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Old 11-09-2020, 09:30 AM   #3
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Thank you. I really appreciate your help.
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