Pipe Insulation, Insulation Material EPDM, Installation Style Unslit, Inside Diameter 3 5/8 in, Wall Thickness 3/8 in, Overall Length 6 ft, Minimum Operating Temperature -297 Degrees F, Maximum Operating Temperature 300 Degrees F, Facing Material Unfaced, Color Black, R Value 1.53, Form Tube, For Copper Tube Size 3 5/8 in, Flame Spread Index 20, Smoke Developed Index 50, Foam Cell Type Closed, Plenum Rating Plenum Rated, Flexibility Flexible, For Tube Outside Diameter 3 5/8 in