Pipe Fitting Insulation Insulation Material Fiberglass Installation Style Slit Inside Diameter 2 5/8 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 Tube Outside Diameter 2 5/8 in Standards ASTM C347 ASTM C547 ASTM E84 Outside Diameter 5 5/8 in