• Refrigeration tubing is measured by its outside diameter O.D: 1/4, 1/2, 5/8, 3/4, 7/8, 1-1/8, 1-3/8, 1-5/8, etc.
• Plumbing tubing is measured by its inside diameter I.D: 1/8, 1/4, 1/2, 1, 1-1/4, 1-1/2, 1-3/4, etc. Rule of Thumb: "HVAC" nominal tube sizing 1/8; larger than the same nominal size "plumbing" pipe.
• So for example, a 1/4" HVAC fitting is the same as a 1/8" Plumbing fitting. Or a 1/2" HVAC fitting is the same as a 1/4" Plumbing fitting.
• For HVAC, a 1/2" fitting will fit on a pipe that's 1/2" on the "outside" (OD), as the fitting has an opening of 1/2". But for plumbing, it will fit onto a pipe that is 1/4" on the "inside" (ID), which equals 1/2 on the outside.

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