Pipe Fitting Insulation, Insulation Material Buna-N Rubber/PVC, Installation Style Unslit, Inside Diameter 1 5/8 in, Wall Thickness 3/4 in, Form Tee, Minimum Operating Temperature -297 Degrees F, Maximum Operating Temperature 220 Degrees F, R Value 5.2, Color Black, For Pipe Size 1 1/4 in, Flame Spread Index 25, Foam Cell Type Closed, Plenum Rating Plenum Rated, Flexibility Flexible, For Tube Outside Diameter 1 5/8 in, Resistance Properties , Flame/Fire Retardant, Standards UL 94