An inner tube is the inflatable ring inside a tyre. Patch the inner tube.
Finding the hole is done by feel or in water, since most are far too small to see. An inner tube should be checked against the tyre, or whatever caused the puncture is still in there.
1nouninner tubeThe inflatable ring inside a tyre.
“The inner tube had four patches already.”
inner tube is a part.
Practised in Cycling