Hello
A few days ago, the cooperative replaced the central heating installation - new pipes and radiators. In the apartment on the top floor, the pipes going over the ceiling to the condenser on the cage have been removed, and in return I have 3 unsightly vents in the premises.
At the top they have something like this:

except that for me, this tiny cap at the top is red.
In one of the rooms it is quite unscrewed, in another it is twisted.
Is it possible that the team has not tightened something and there is a risk of flooding when they start heating for the first time in the season in my absence?
A short leak test was carried out, but the gentlemen ran so quickly, then others fell in and twisted something, etc. near the radiators and plumb, that I wonder if they tightened something. Can I just close these tapes myself? Then, however, they will not jump and release air, as it was during the test.
A few days ago, the cooperative replaced the central heating installation - new pipes and radiators. In the apartment on the top floor, the pipes going over the ceiling to the condenser on the cage have been removed, and in return I have 3 unsightly vents in the premises.
At the top they have something like this:

except that for me, this tiny cap at the top is red.
In one of the rooms it is quite unscrewed, in another it is twisted.
Is it possible that the team has not tightened something and there is a risk of flooding when they start heating for the first time in the season in my absence?
A short leak test was carried out, but the gentlemen ran so quickly, then others fell in and twisted something, etc. near the radiators and plumb, that I wonder if they tightened something. Can I just close these tapes myself? Then, however, they will not jump and release air, as it was during the test.