Pipe Insulation, Insulation Material Buna-N Rubber/PVC, Installation Style Slit with Adhesive and Flap, Inside Diameter 3 1/2 in, Wall Thickness 1 in, Overall Length 6 ft, Minimum Operating Temperature -70 Degrees F, Maximum Operating Temperature 220 Degrees F, Facing Material Unfaced, Color Black, R Value 6.1, Form Tube, For Pipe Size 3 in, Flame Spread Index 102, Smoke Developed Index 127, Foam Cell Type Closed, Plenum Rating Plenum Rated, Flexibility Flexible