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Groove in PTFE coupler

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Dear all,

today finally I got some time and wanted to install my Olsson block.

Unfortunately I could not remove the temperature sensor, it broke, so I have to order a new one.

Anyway, since I unmounted the original heater block I took this opportunity and examined the PTFE-coupler.

Inside at the bottom end I can see a groove. See left part of the attached image:

ZgOd1MV.jpg

The groove is not everywhere. It is distributed on I guess 60% of the inner diameter.

40% are flat without any groove. See right part of the attached image.

My questions now:

1. What is the reason for this groove?

2. Should I replace the coupler?

3. If I don't replace the coupler, what consequences it has e.g. for printing, print result?

Thanks for any help!

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