SN should there be a lid under the cap?

[darkwater]

Hello,

on bottles like this should there be a lid under the cap? Or will I unseal it when I open the cap? I feel a little stupid why did not I buy two bottles?

 

[FromGermany]

SN is so hygroscopic. It has to be airtight. Is the cap absolutely fixed, so that you cannot move it even not for 1 mm to the right or left? In this case I would not open the bottle.