Well if its not there, the pump cavitates like crazy and howls while it's doing it. There is a nozzle in the pump union which pushes all the fluid through the liner which could be some kind of constant pressure / variable flow device (or vice versa). Its there in all VAG ps hoses in some form. It could simply be to reduce noise - I couldn't tell any difference in the steering feel with a plain hose fitted.
I've never seen a cross section of it, but I could draw one from the bits I have on the bench.
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