to increase pressure so the water flows and doesent go stale
Removing any air in the system.
water distribution system ===
no, heating, venting, air condioning = hvac
Provide air flow to or from drainage system and to protect trap seals from siphonage and backpressure.
Yes,the toilet is part of the plumbing system.
A plumbing supplier should have it.
The Fresh Air Inlet (FAI) is where the venting system starts as it draws the colder air into the system and allows it to vent through the vent terminal
air in a boier system: noise, possible no/ low heat in certain areas. usually means system needs to be bled / pressure checked. air in a potable sytem: cracked line in well above water level. recent plumbing service. gasses present in well water.
Usually any noise from plumbing is caused by air trapped in the system
No, it is against the plumbing code.
Nothing has replaced the plumbing system under the Colosseum. It is still there.
I've had that before, and it is generally air in the lines, caused by a clog.