Backflow Preventer 765 3/4

After getting tired of paying $30-$40 for a backflow preventer kit every year due to the poor quality and design. I decided to make my design my own backflow preventer.
This design has been modified and reinforced to fit Febco 765 3/4 system. (see the image of the original backflow preventer).
I recommend printing with at least 80% infill, 100% is even better to prevent water pressure from finding its way through the hollowed areas. Printing support it needed.