Tubing
Tubing and pipe are two very different things.
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Pipe is sized and measured by inside diameter (ID)
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Tube is measured and sized by outside diameter (OD)
Tube can be seen in sizes up to 50mm or 2”, pipe sizes are well beyond this.
Small bore tubing (SBT) systems are often thought of as a simple system that are low tech and un-complex but this is untrue.