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Thanks. I had not thought about that pressure build-up aspect. I assume that this outside vent has to be far away from or above the cabin roof (ie I could not just T off the main drain under the cabin to relieve that pressure)? How big does this vent pipe need to be?

Thanks for the feedback. I will update my plan accordingly.

I am currently designing a DWV system for a small cabin and, since I'm new to this, I would like feedback on the approach. I'm in the boonies so no inspection is required but still want to make sure I follow best practices. I made a mockup of the bathroom group (shower, WC and lav) with my...