Print these two parts in PETG to connect a 75mm PVC drain pipe through a plastic wall.
Cut a 60mm hole in the walll, and use PVC glue to glue the 3d printed parts to each other and the wall.
I used it to convert a 110mm endcap to a 75mm connection (see pictures). Print files are provided for additional details.
The author hasn't provided the model origin yet.