If you are concerned that it may be leaking, you can seal the ends with a dab of epoxy, which will harden and provide a bit of a seal.
You can also use a good quality hose clamp to close off the connection. Be sure not to overtighten the clamp, as this will cause the hose to kink and possibly break.
If the hose is leaking badly or has been punctured, it may be necessary to replace the entire hose.