1. Oxygen –controlled atmosphere (mostly CO2)
2. ensiled feed
3. cavity over unloader (with non-free-flowing feed)
4. fill pipe
5. unloader sweep-arm
6. sealed fill hatch
7. two-way pressure
8. sealed hatch
9. airtight container
10. seaked entry hatch
11. silo floor
12. power head for unloader
13. sealed unloader discharge port