Yes, it is the braided hose that needs blocking or clamping.

That "T" connector in the air intake pressure sensor vacuum line is normally connected to something I hope? Looks suspiciously like someone has tried to block it with some sort of goo? Maybe you have a Scottoiler fitted and the vacuum take-off was removed in the photo, or perhaps it did have one fitted and a previous owner has attempted to block the connector?

As for the airbox drain, I can't understand why anyone would block it off? It does still have the rubber bung in the other end? If I were you, I'd unblock it as it is the only visual tell-tale that you have water or oil in the airbox. I know you don't at the moment, but best to prepare for the future.

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