Get World Flex Insu insulation for air conditioning ducts with a diameter of 7/8 inches and a width of 3/4 inches. This insulator is designed to provide effective protection for air conditioning and refrigeration ducts against heat leakage and moisture. Brand: World Flex Insu. Diameter: 7/ 8 inches. Width: 3/4 inches. Use: Used to insulate and protect air conditioning and refrigeration pipes.