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rear remote resevoir - just curious

Joined May 2015
7 Posts | 0+
England
Hi,
2015 low seat spec UK (aka only UK spec) Hyperstrada.
The rear remote reservoir has a small round knurled knob at the bottom.
This knob does rotate, at least on my bike but I'm pretty sure it serves no 'user' purpose. Might be used if the reservoir were to be serviced?
Anybody any ideas what it is/does?
Thanks
Andrew