What is the fan looking piece over water-sprinkler pipe valves & why water flows out of it when water is on?
Question: This test is a fan looking under a metal cap and when I turn the stopcock on the flows unabated in metal hood fan.
Watering has not been used for a long set, but works.
Answer: I think you describe the anti-siphon valves on common area.
Once the amendment has passed through the valve, it is not considered potable, or drinkable, if you're not thirsty to come backwards through the pipes of the house.
Once the joint is passed through the valve, it is not considered potable, or drinking, so you do not miss coming back through the pipes in the house.

For the first period, there is now an FM Approved vent for wet pipe fire sprinkler systems that provides leak protection without piping to a tax". ...







