How is back pressure created?

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Tags

1. #resistance
2. #system
3. #using
4. #overcome
5. #pressure
6. #gases
7. #exhaust
8. #backpressure
9. #order
10. #discharge
11. #produced
12. #atmosphere
13. #hydraulic
14. #spelled
15. #defined
16. #engine
17. #hyphen