What is the reason behind maximum length =4" for a p trap seal ?
Based on multiple Google search results the maximum seems to be 4"
https://www.google.com/search?q=plumbin ... l%22+lengh
What is the law of physics that imposes this constraint ? What happens if you make it longer ?
https://www.google.com/search?q=plumbin ... l%22+lengh
What is the law of physics that imposes this constraint ? What happens if you make it longer ?
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