Pipe Fitting Insulation, Insulation Material Fiberglass, Installation Style Slit, Inside Diameter 1 5/8 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 1 5/8 in, Standards ASTM C336, ASTM C547, ASTM E84, Outside Diameter 3 5/8 in