You are seeing it wrong.
Air chambers will water log very quickly.
Hammer arrestors are used now, to prevent water logging.
The one on the left is for a washer.
The one in the center can be soldered onto a tee.
The one on the right can be used inline like for a lav supply or an icemaker line.
The fallacy of air chambers
It used to be thought that an air chamber, or capped stand-pipe, was an effective solution to controlling water hammer. However, within an air chamber, nothing separates the air from the water. It only takes a few short weeks before the air is absorbed into the water, leaving the air chamber waterlogged and completely ineffective. Laboratory tests confirm that the air is depleted by simple air permeation and by interaction between static pressure and flow pressure.