Pipe identification

It's described as vacuum piping, although I suspect it's more associated with the coolant system (probably something like an anti vacuum lock arrangement or of that ilk).

Have a look here:

toyota-europe.epc-data.com/rav4/ala30l/5565/engine/1708/?partno=9041304008

toyota-europe.epc-data.com/rav4/ala30l/5565/engine/1708/?full

Those are probably the associated Toyota part numbers around that area.

As a double check, go back to here:

toyota-europe.epc-data.com/rav4/

Enter your VIN and if recognised you should be able to go through to the correct engine parts diagrams. (I'm fairly certain the ones I reference about are correct, but the VIN search should get you to the right diagrams).