Reddit reviews Frost King Pre-Slit, Tubular Polyethylene Foam Pipe Insulation, 3/8" Thick Wall, 3-Feet

3/8in thick wall, bulk 3Ft lengths4 pack - 3Ft closed cell polyethylene foam, pre-slitFits 1in Copper or 3/4in iron pipesPrevents pipes from sweating and drippingR-value 2.13-Feet Black Tubular Polyethylene Foam Pipe InsulationHelps To Prevent Pipes From Freezing Or SweatingComes Pre-slit, With Heavy-duty 3/8-Inch Wall ThicknessFor Use On 1-Inch Copper Pipe, Or 3/4-Inch Iron PipeComes With 4 To A Pack