if it`s the one by the rear of the engine it should have a small green pcv 1 way valve on it mine had broken at the valve,
look at the air filter box and check the thick air hose that goes towards the rear of the engine, and you can see where a pipe was meant to be connected on the top part maybe sheared off but it connects from there to the pcv valve and to the part you are showing.
i repaired mine but i have no idea what it does nor did it make any difference to the running on or off
hope this helps