A spare valve stem for JTS Airguns is a small metal or plastic rod that is used to control the release of compressed air from the airgun's valve. It is specifically designed to fit JTS airguns and can be used as a replacement part if the original valve stem becomes damaged or lost. The spare valve stem is typically made of high-quality materials to ensure its durability and accuracy, and it is an essential component for proper airgun operation. Without a properly functioning valve stem, the airgun's pressure may not be released correctly, leading to potential safety hazards and inaccurate shooting.