Pipe Insulation, Insulation Material Buna-N Rubber/PVC, Installation Style Slit with Adhesive and Flap, Inside Diameter 1 3/8 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 7.3, Form Tube, For Copper Tube Size 1 3/8 in, For Pipe Size 1 in, Flame Spread Index 118, Smoke Developed Index 143, Foam Cell Type Closed, Plenum Rating Plenum Rated, Flexibility Flexible This K-Flex(R) Insul-Lock(R) DS pipe insulation is a closed cell, preslit, flexible elastomeric foam material that comes with a pressure-sensitive adhesive on the seam, plus flexible PVC overlap tape with acrylic adhesive for added security. The insulation comes with an antimicrobial agent that is mol.