Strange filter inside 990R Fuel tank

[Legadema]

I found this little filter in one of my fuel tanks, while cleaning it, after filling my bike with fuel from containers that contained some white paint.
Does anybody knows what it’s for, or if it belongs in any way on the 990R

 

[Adventurer]

 

[Chrisl]

 

[Legadema]

 

[Chrisl]

 

[user 3169]

 

[Legadema]

 

[Crowley]

 

[Adventurer]

 

[superten]

 

[Crowley]

 

[Legadema]

 

[Adventurer]