It has diffuser (literally named as such, similar to the diffusers in water tunnel, it arranges the flow), i don't think there is a *modern* submarine without one of these.Greek U-214 has the same propeller but without the vortex diffuser (I wonder whether the vortex diffuser can be placed later on as well, if so the Greeks have exactly the same propeller)
But without vortex diffuser the Greek submarines are a bit in dissadvantage as the modern torpedo's like DM2A4 seehecht (and also our own AKYA) have the vortex (Dümen suyu) guidance ability (especially when approaching from behind).
Since we know that the Greeks have purchased the DM2A4 it is smart of our navy to have the vortex diffuser. It should be the Greeks worrying if they cannot add on the diffuser (they would need to change the whole propeller complex, which is an expensive game)
And noticed Greeks operate same propeller but made of copper-alloy, not FRP.
https://flic.kr/p/9fy2SE
Also looks like Egypt was not granted a right to have a most up-to-date propeller, their Type 209NG was bundled with old high skew propellers and old kind of diffuser.
Up close, from Type-212
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