Reflectix SPW0402512 4-Inch by 25-Feet Spiral Pipe Wrap Simply wraps around your pipes or duct work overlapping approximately 1/2-Inch as you go Secure with refectix reflective foil tape (4280-3007) around each end of your wrapped product Provides an air space between the pipe and the wrap that will aid the insulation value 4-Inch by 25-Feet roll R-4 Rating in this application