Top Floor Automatic Air Vent Leak: Can Cap Be Tightened or Removed? Tips & Solutions

Hello, I live on the top floor in the block and in the bathroom I have a vent on the pipe which is in the shape of an inverted letter "U" and on its top is a pipe to which the vent is attached.

Water started to leak from the pipe, the technicians came, looked and said that I was to make a hole and hit this "pear" lightly on top with a hammer and went.

Because of the fact that I don't know much about hydraulics, I said "ok" and I followed the command + I additionally tightened the plug which was at the very top. The water stopped dripping. I do not know whether because of a knock or tightening the cork.

My question to you is: Can this plug be tightened? Or how? On Monday I will get to cooperative technicians but I would like to be able to sleep peacefully so I write here.

I attach a photo. I can't do better because the previous owner shot this building. The second photo is what I think I have - it's supposedly called the automatic air vent.

Hello.Kapala water is good because there was no air in the system, the heating system was deaerated. The screw should be tightened, and the name automatic air vent says that the device should be emptied automatically under the influence of water pressure of about 1.5 bar and no air should close this valve seal.

All right, here are some questions:
1. Why was this valve untightened?
2. If they start burning, will this plastic cap withstand the pressure. After all, it's plastic?
3. Do I have to unscrew this nut from time to time? Why should I, as a resident, be responsible for venting the entire riser as if they could not give this vent one floor above where the dryer is: /
4. How do I vent this system after turning it off when the cap is turned off?

Because such activities should be serviced by employees of a housing cooperative before the heating season, and placing this device in the room is the highest point in the central heating installation of the building. All failures of this type should and should be reported to the administration, and not attempt to repair it yourself.

1. because under normal circumstances of nature, the cap is unscrewed so that the air can escape.
2. there is no pressure on the screwed cap, unless the internal valve is damaged, but it is not enough to damage the cap.
3. the cap should be unscrewed during normal operation. If water is leaking, the vent should be replaced with a functional one, or as your practitioners have said, you can swipe it so that the internal valve closes.
4. go to 1.

I agree. I live here exactly a year and there has never been anyone with me in this connection. On Monday I go to the technical department of the cooperative. Then I will share with you what I know.

If you care about aesthetics, talk about deleting this trash by the way
Until they heat up yet.

Aesthetics is not a problem because, as I wrote, it is built-in tiles. At the bottom and top there are 2 boxes in the building and this photo as you can see is taken by putting a hand in the top box.

Subject to close. People came today from the cooperative twisted the old and screwed in a new one. Seamlessly.