Pipe Insulation, Insulation Material Melamine, Installation Style Slit with Adhesive, Inside Diameter 1 3/8 in, Wall Thickness 1 in, Overall Length 4 ft, Minimum Operating Temperature -40 Degrees F, Maximum Operating Temperature 350 Degrees F, Facing Material PVC Jacket, Color White, R Value 5.82, Form Tube, For Copper Tube Size 1 3/8 in, Flame Spread Index 25, Smoke Developed Index 50, Foam Cell Type Open, Plenum Rating Plenum Rated, Flexibility Flexible, For Tube Outside Diameter 1 3/8 in