Need help identifying this coolant hose

[Jinster]

Hi everyone. I have a coolant hose leak. But I don't know what this one is called or what the part number is. Can somebody point me at the right direction please?

 

You can see it's the hose covered in pink coolant in the photos. It connects to a small metal coolant tube? on one end, and seems to run towards the rear firewall on the other end. It is located right next to the AOS and runs underneath and perpendicular to the AOS breather hose.

 

 

 

1. What/what part number is it?

2. Is it easy to replace DIY?

[Jinster]

I have since worked out that the metal pipe (to the right of the rubber hose in the first photo, also covered in pink coolant residue) this rubber hose connects to is called a "breather hose" for either cooling the engine and that it may (or may not) be only for Boxsters with an automatic transmission. The part number for the metal pipe is 99610621002. Except whenever I search 99610621002, it always comes up in parts diagrams on its own. It never shows which coolant hose then connects onto it. It's the coolant hose that connects to 99610621002that I am interested in....

 

Can someone knowledgeable please help. Cheers.