I'm not sure, but it appears to be a flex tube with a sponge type filter. The blow by tube drains to the ground and EGR is not hooked up. As it was after dark when I got home I could not give the car a thorough going over.

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2dieseljohn
1979 300sd (283,000+) Road Trips
1983 240D 4-speed (350,000+) Daily Driver
1967 E-TypeS1 in bits and pieces