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Part #2 in the diagram should be a straight hollow joint, some VX's do have a PCV valve, some do not and the straight joints were sometimes replaced with PCV valves by mechanics who thought something was missing, so it's worth checking to see if either of the joints have a valve in them, if they do then make sure it's moving like it should, if it's gummed up or broken you can replace it or you can carve off the end of the plastic and pull the guts out and leave it as an empty joint.
I've seen after market PCV valves used where the upper elbow is and the after market ones are often two pieces, the valve body being one piece and the 90degree elbow being another, where the two bits of plastic join is also sometimes a vacuum leak point.
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