Pipe Insulation Insulation Material Mineral Wool Installation Style Slit Inside Diameter 2 3/8 in Wall Thickness 1 in Overall Length 3 ft Minimum Operating Temperature 0 Degrees F Maximum Operating Temperature 1 200 Degrees F Facing Material Unfaced Color Green R Value 4.4 Form Tube For Copper Tube Size 2 3/8 in For Pipe Size 2 in Flame Spread Index 25 Foam Cell Type Open Plenum Rating Plenum Rated Flexibility Rigid For Tube Outside Diameter 2 3/8 in