Yes it is, it's made of rubber, it's been molded into a 90deg bend and it has a check valve in it. S4 FSM page 11-18, S5 FSM pages P-25 (NA) or P-35 (Turbo). Looks pretty clear to me, as it does in the various LHD FC engine bays pics I have.

The only person to mention the hard line was you. Everyone else is talking about the rubber hose, including the original poster.

 

Iceblue, will you please stop giving out WRONG and BAD advice? When someone has proven you don't know what you're talking about and that you are incorrect, give up... You don't need to keep arguing something you are clearly wrong about or don't understand fully. And the only one being "stupid" or that is "arguing" is you because you do not fully understand what is being discussed.