Hi,

I've found a coolant leak but unsure what the part is called in order to replace. It's the plastic joint - the right one (not left) that connects pipe to middle (round) box. The side you can't see gushes coolant when engine is running. Its in the middle of the joint and not the edges that pipe connects to so I'm sure I need to replace it. I can even put my finger on it to stop the leak.

Here are some pictures.










Any ideas?
Many thanks.

UPDATE - more picutres








other end of pipe into bulkhead





underside shows hole!