In the case of certain types of the sparging stones, the ID of the stems fits around the OD of the low pressure tubing. The following schematic should clarify. The ID of the sparging stone stem and the OD of the low pressure tubing are the same (red lines). The OD of the sparging stone stem (green) is larger than the ID of the low pressure tubing (blue).

In another type of sparging stone, the OD of the sparging stone stem and the ID of the low pressure tubing are the same (blue lines). The ID of the sparging stone stem (orange) is smaller than the OD of the low pressure tubing (red).

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