planning

I'm trying to plan out my new plumbing to connect a wall hung toilet to and existing 2" drain and vent. In the image below the new wall hung toilet is covered in black plastic to help keep things clean. The old 3 inch drain is in the left bay and turns vertical down through a 2x4 supporting wall...

Hello all, First of all, thank you for your time. It’s much appreciated. I’m located in HI and this will need to pass inspection. I have some questions about under-slab drains and my venting plan. As you can see in the pictures, the wet wall is facing the septic. Septic is already installed. I...