page_title: Valve stem
hierarchical_section_title: Valve stem
caption_attribution_description: English: Bicycle repairer, adjusting a damaged valve. This is an image of "African people at work" from Nigeria
context_page_description: A valve stem is a self-contained valve which opens to admit gas to a chamber, and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, or both, to prevent the gas from escaping. They are most commonly used on automobile, motorcycle, and bicycle tires, but also for many other applications.
context_section_description: A valve stem is a self-contained valve which opens to admit gas to a chamber (such as air to inflate a tire), and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, or both, to prevent the gas from escaping. They are most commonly used on automobile, motorcycle, and bicycle tires, but also for many other applications.
caption: Replacing a valve stem.
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