Hi Jan,
I was hoping that Dale of someone else more familiar with plumbing issues would comment.
Those "Oatey" vents, and other "air admission" vents, are designed to help avoid a situation where a negative pressure in the drain pipes could cause the water to be pulled out of the trap, allowing sewer gas to enter the living space. These vents can only let air in. They don't really replace the need for a vent to the outside.
Clogging issues are just as likely to be caused by pressure building up ahead of the waste flow. This is often indicated by wastewater backing up through other fixtures. An air admission valve will do nothing to help in that case.
My 2cents worth
John Grube
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Posted by: grubemed@yahoo.com
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