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Thanks for your comment. I will look into combination waste and vent systems.

Thanks for your comments. I will do more research.

Thanks Wayne. I utilized the chapter found here: https://docs.legis.wisconsin.gov/code/admin_code/sps/safety_and_buildings_and_environment/380_387/382.pdf That has this chart: It looks like the 2" diameter of fixture drain, pitched at 1/4 per foot, can have an 8-foot length to the 2"...

Yes - the 90-degree elbow is the lowest fitting and it is a long sweep. Thanks for asking

Interesting plumbing system: offset partial wet-vent with branches after reduction. No violation of codes? The system is typical. Coming up through a concrete crawlspace floor is 4” PVC with a 90-degree elbow below the floor that leads to an on-site septic. The first connection in the stack is...

Interesting plumbing system: offset partial wet-vent with branches after reduction. No violation of codes. The system is typical. Coming up through a concrete crawlspace floor is 4” PVC with a 90-degree elbow below the floor that leads to an on-site septic. The first connection in the stack is...