Thread: 40 years of trailering...still learning
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Old 09-15-2022, 01:29 PM   #10
Foldbak
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Location: Shingle Springs
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M.O.C. #30417
Quote:
Originally Posted by Carl n Susan View Post
That is an Air Admittance Valve that is used in place of a vent stack.

https://www.oatey.com/faqs-blog-vide...ittance-valves
I don't suppose their using those on black tanks....
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