SJ SN Vent line broke, how does it work ?

The plastic inlet of the filter vent broke off and it looks like I will have to replace the filterit.Therefor a couple of questions.

How important is this for the engine/running of the ski ?

What can happen if it is disconnected ? What is the little valve in the line for ?

How does it actualy work ?

Thank you for any help.

Chris
 
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