Orings included with Protank 2

[Skenzer]

Feeling kind of stupid here but I need to ask. I just received my protank 2 and included in the box were too small spare O-rings. They looked to be too small to be replacements for the top and bottom of the glass. So what are they for?
Thanks for any help

 

[EvilZoe]

Feeling kind of stupid here but I need to ask. I just received my protank 2 and included in the box were too small spare O-rings. They looked to be too small to be replacements for the top and bottom of the glass. So what are they for?
Thanks for any help

They're for the base of the removable drip tip. DON'T LOSE THEM.