If the air is leaking at the ends of the red lines in the photo, then get a new tube.
If the air is leaking from the very end of the valve brass, then possibly the valve core can be replaced from a damaged tube that otherwise was functioning (also the core can be checked for being tight within in valve stem).
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If the air is leaking at the ends of the red lines in the photo, then get a new tube.
If the air is leaking from the very end of the valve brass, then possibly the valve core can be replaced from a damaged tube that otherwise was functioning (also the core can be checked for being tight within in valve stem).
The tool : valve core removal tool
https://a.co/d/eWjLvPc