Use cyanoacrylate glue (superglue) to bond the ends together. Hold the joint in firm compression for at least 90 seconds. Allow at least 3 hours before fitting.

The glue will dissolve the rubber to form a strong but flexible joint. Any excess that is squeezed out of the joint will be brittle, and can be chipped off with a blunt knife.

After at least 3 hours test the joint by firmly pulling to load the joint in tension.