Pipe Insulation, Insulation Material Buna-N Rubber, Installation Style Unslit, Inside Diameter 5/8 in, Wall Thickness 3/4 in, Overall Length 6 ft, Minimum Operating Temperature -297 Degrees F, Maximum Operating Temperature 250 Degrees F, Facing Material Unfaced, Color Green, R Value 5.3, Form Tube, For Copper Tube Size 5/8 in, For Pipe Size 3/8 in, Flame Spread Index 126, Smoke Developed Index 151, Foam Cell Type Closed, Plenum Rating Plenum Rated, Flexibility Flexible