Ideal high pressure sensing pipe can be found in the automatic air vent section. The automatic air vent is a safety mechanism that allows unwanted air to be released from the system. When water enters the device, the air vent shuts down automatically. The device works by using a small floatation device located within the automatic air vent. As water flows through, the float rises and closes the valve. This will then remain closed until the water level drops and the float falls with it, at which point the vent will reopen.