Copper Fitting 1-1/8 to 5/8 (HVAC Dimensions) Reducer / Increaser Copper Coupling & HVAC – 1 to 1/2 (Plumbing Inner Dimensions) 99.9% Pure Copper - 10 Pack w20h20 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 26" OR 26" x 36" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 24" or 24" x 10" duct opening (measured at the opening)

Design – Individually adjusting curved blades

+ Product Details Size - 34"w X 30"h X 2"d (for duct opening measurement only)

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Copper Fitting 1-1/8 to 5/8 (HVAC Dimensions) Reducer / Increaser Copper Coupling & HVAC – 1 to 1/2 (Plumbing Inner Dimensions) 99.9% Pure Copper - 10 Pack w20h20 + Product Details Perfect FitHow 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