Yes, and that elbow hose that the PCV fits into becomes very hard over time. The one on my car was so bad the PCV valve flopped in and out of it very easily. I just replace the entire tube assembly and now it is actually difficult to get the PCV valve into it.
Either replace it when you do an intake rebuild/cleaning or wrap a zip tie around it to maintain a good seal. Mine was so bad it caused a weird whistling sound under high manifold vacuum (open throttle, low rpm).
-Lance
