Thanks for the help. I’ve just got a new hose with the listed part code however just like the old one it doesn’t seem to sit perfectly and has a bit of movement. It connects to the expansion tank absolutely fine. It’s a plastic piece that attaches to the rubber hose nice and snug and then inserts into the plastic housing, it’s at this point there is a small amount of movement. Even with the metal clip locking it into place there’s a small amount of movement and It seems that when under any sort of pressure the coolant pushes it and it escapes. Am I missing something or is there meant to be an o-ring or seal? That would lock this into place and stop the coolant escaping under pressure?