Agree, sounds like the return for the standard re-circ dump valve.
The left hand end will attach to a short flexi/rubber pipe then attach to the main intake hose just infront of the Turbo.
IIRC it's bolted to the underside of the intake manifold so would be hard to get off, and you would still need to blank it off if youi are using a VTA Dump Valve.
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