Pipe Fitting Insulation Insulation Material Fiberglass Installation Style Slit Inside Diameter 4 in Wall Thickness 1 1/2 in Form 90 Degrees Elbow Minimum Operating Temperature 0 Degrees F Maximum Operating Temperature 450 Degrees F R Value 7.5 Color White For Pipe Size 4 in Standards ASTM C320 ASTM C547 ASTM E84 Outside Diameter 7 in