A chamber or cavity filled with air, in an animal or plant.

A cavity containing air to act as a spring for equalizing the flow of a liquid in a pump or other hydraulic machine.

An enclosed space containing air. In bridge work it usually refers to the working chamber in a pneumatic caisson.

a vertical pipe located in the wall cavity at the point near a faucet or valve where the water supply pipe exits the wall

A closed section of pipe or other container designed to trap air at atmospheric pressure when mounted on a tee in a water supply line and intended to reduce water hammer pressures.

Vertical, air-filled pipe or spring coil, set above the water line to absorb pressure when water is turned off at the faucet. Pressure absorbing devices to eliminate water hammer.

Chamber or capped pipe filled with air to prevent water hammer.

A vertical, air-filled pipe that prevents water hammer by absorbing pressure when water is shut off at a faucet or valve.

A chamber filled with air and that serves to eliminate the pulsations caused by the operation of piston or rotary-gear pumps; a pulsator eliminator.

An extra length of pipe installed vertically on a supply line near a fixture to prevent water hammer.