Pipe Insulation Tube, Insulation Material Buna-N Rubber, Installation Style Unslit, Inside Diameter 1/2 in, Wall Thickness 3/4 in, Overall Length 6 ft, Minimum Operating Temperature -40 Degrees F, Maximum Operating Temperature 250 Degrees F, Facing Material Unfaced, Color Green, R Value 4.7, Form Tube, For Copper Tube Size 3/8 in, For Pipe Size 1/4 in, Flame Spread Index 25, Smoke Developed Index 50, Foam Cell Type Closed, Plenum Rating Plenum Rated, Flexibility Flexible