Pipe Fitting Insulation Insulation Material Fiberglass Installation Style Slit Inside Diameter 4 1/8 in Wall Thickness 1 in Form 90 Degrees Elbow Minimum Operating Temperature 0 Degrees F Maximum Operating Temperature 450 Degrees F R Value 5 Color White For Tube Outside Diameter 4 1/8 in Standards ASTM C340 ASTM C547 ASTM E84 Outside Diameter 6 1/8 in