| 11. | The proximal region contains valves which prevent the backflow of sperm when muscles dilate.
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| 12. | This drift tube prevents backflow of electromagnetic radiation.
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| 13. | In the United States, the minimum backflow protection is usually determined by state regulation.
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| 14. | Many water suppliers require this, and plumbing code may legally require permanently installed backflow preventers.
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| 15. | These deep veins are enclosed inside contracting muscles, and contain valves that prevent backflow ).
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| 16. | Backflow preventers are categorized into three groupings, an Assembly, a Device or a Method.
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| 17. | Backflow preventers and nonbypass pressure regulators are valves that prevent contamination of a municipal water supply system.
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| 18. | Therefore, it is very important to understand the proper level of backflow prevention required by law.
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| 19. | :You could start with plumbing here; it's possibly a " backflow preventer ".
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| 20. | This prevents backflow of air, keeps out some rain, and provides a bit more privacy.
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