New lavatube kit help

[GLuck4410]

So I got a lavatube 2.5 kit and it came with a little round clear rubber piece that I don't know what to use it for. I have been using my lavatube without it but just wondering what it is for.

 

[akiyn78]

Could you post a pic. Could be just be packing material or an insulator for button top battery.

 

[Ryedan]

Yup, more info will help.

 

[GLuck4410]

How to put a pic on with an iphone?