What are these for

[Rubio]

I removed these plastic rings from the gas cap vent tubing. I didn’t think they were OEM until I saw them in another photo on here. Are they intended to allow the tubing to slide freely while clamped?

 

[ST1100Y]

Dunno how or why you'd removed them...
they attached to the vent/bleeder above & below the metal clamp on the tank, preventing named hose from slipping down/getting pulled up while handling the cap...