Just figured I'd add some content here so I'm just going through old photos/videos.
this post was submitted on 13 Aug 2023
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Plumbing
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Ahh those are just air chambers which are still required in most of the locations that I work.
Aha, never heard of those before. Learned something new today, thanks!
For others in the dark: https://plumbingreview.net/what-is-an-air-chamber-in-plumbing/
The ones that are in the pictures of the article you sent are actually effective, the ones that we use that's acceptable by code still is just a 12 inch pipe with a cap. They don't really work though because over time the air pockets full up with water so they basically become useless.