What is the difference between inner diameter (I.D.) and outer diameter (O.D.)?
The Inside Diameter is the inside measurement from one inside edge to the other inside edge on the interior of a hose, tube, pipe or other object. It is often abbreviated as I.D.
The Outside Diameter is the outside measurement from one outer edge to the other outer edge of a hose, tube, pipe, or other object. It is often abbreviated as O.D.