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Old 07-27-2013, 02:10 PM   #15
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Dick, I can't locate the implementation date for the RVIA standards, perhaps you will be successful where I failed.
That website is only an overview of the standards, the actual verbage must be purchased.

This is an excerpt from the website: "Vents to release gases from any waste holding tank must be provided." To me that means the vacuum-breakers under the counter cannot be the only opening, as they are not a vent. I sure would not want one inside my RV releasing any tank gasses purposely.

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Old 07-27-2013, 02:34 PM   #16
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Ray,IN, you are correct, from the RVIA standards: "Anti-Siphon Trap Vent Device (ASTVD) The anti-siphon trap vent device (ASTVD) is a secondary vent that can only be used in applications where an exterior vent is also provided.
The venting system allows air into and out of the drainage system. The ASTVD uses an atmospheric pressure-controlled valve that will allow air into the system, but not out of the system. Because it does not allow air out, it must be used in conjunction with a primary vent, i.e., exterior vent."


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