Pipe Fitting Insulation, For Fitting Type Tee, Wall Thickness 2", Material Fiberglass, Insulation Nominal I.D. 1-5/8", Color White, For Tube I.D. 1-1/2", For Tube O.D. 1-5/8", Temp. Range 0 Degrees to 450 Degrees F, Approx. 'R' Factor 10, For Use On Piping, Standards ASTM C547, ASTM C409Features:Color -White For Tube I.D. -1-1/2" For Tube O.D. -1-5/8" Temp. Range -0 Degrees to 450 Degrees F Approx. 'R' Factor -10 For Use On -Piping Standards -ASTM C547, ASTM C409 WARNING: California Residents:This product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. California proposition 65 warning.