I replaced a plastic elbow joint which had a crack in it. One end of the elbow has a PVC pipe fitted into it, and the other end is copper, which connects to an outside tap.
I replaced the plastic elbow with the same model and size (Hep2O 15mm elbow) with a sleeve inserted between the copper pipe and elbow to ensure a snug connection.
However, there is water seeping out from the connection between the elbow and copper pipe (see picture). Is there anything I can do to get the copper pipe to fit better? The pipe itself doesn't appear to be deeply scratched or damaged.