Air Chambers or Cushions Often pipes will bang when a faucet or valve is suddenly cut off. This can damage the pipe and is irritating to live with. The banging is caused because water does not compress when its flow is suddenly stopped. To prevent this, we recommend installing manufactured air chambers, or shock absorbers, into the hot and cold supply lines at each fixture. These contain inert gas and bellows that absorb the shock. These manufactured products work better than using a one foot length of copper pipe as these must be drained every few years. These fittings may need to be replaced or have parts within them replaced on a regular schedule.