ring

There is a white pull ring under the seat attached to a cable, pulling on it doesn't really do anything. Any idea what it is? Bike is 2017 RC390.

The piston has three rings and a circular wire (looks a bit like a spring). Anyone know where the wire gets installed? I'm thinking it goes in the gap of the bottom ring, but it doesn't want to stay there, so I'm wondering if it goes somewhere else? Thanks, Mike