Pipe Insulation, Insulation Material Fiberglass, Installation Style Slit with Adhesive and Flap, Inside Diameter 4 5/32 in, Wall Thickness 1/2 in, Overall Length 3 ft, Minimum Operating Temperature 0 Degrees F, Maximum Operating Temperature 850 Degrees F, Facing Material ASJ Facing, Color White, R Value 2.2, Form Tube, For Copper Tube Size 3 1/2 in, For Pipe Size 3 1/2 in, Flame Spread Index 25, Smoke Developed Index 50, Foam Cell Type Open, Plenum Rating Plenum Rated, Flexibility Rigid