Pipe Fitting Insulation, Insulation Material Buna-N Rubber/PVC, Installation Style Unslit, Inside Diameter 4 1/2 in, Wall Thickness 3/4 in, Form Tee, Minimum Operating Temperature -297 Degrees F, Maximum Operating Temperature 220 Degrees F, R Value 4.6, Color Black, For Pipe Size 4 in, Flame Spread Index 25, Foam Cell Type Closed, Plenum Rating Plenum Rated, Flexibility Flexible, For Tube Outside Diameter 4 1/2 in, Resistance Properties Antimicrobial, Flame/Fire Retardant, Standards UL 94. This item has been restricted from sale in the following state (s): []