Copper Tee

How to measure HVAC & Refrigeration tubing Refrigeration tubing is measured by it's 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 it's inside diameter I.D: 1/8, 1/4, , 1/4, 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" Plumbing1fitting. 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 to 1/2 on the outside. HVAC Premium has been providing superior in quality service for many many years. Our products are second to none, and we've helped numerous contractors, DIY projects, and home improvement remodeling specialists complete their masterpiece. If you are looking for