JOHNS MANVILLE 690458 - PIPE INSULATION WALL TH 2 IN FOR 1/2 IN - PIPE INSULATION INSULATION BODY MATERIAL FIBERGLASS TYPE - PIPE INSULATION HINGED WITH SELF SEALING LAP WALL THICKNESS - INSULATION 2 IN. INSULATION LENGTH 3 FT. FITS PIPE SIZE - PIPE INSULATION 1/2 IN. FITS TUBE SIZE 7/8 IN. INSULATION NOMINAL I.D. 7/8 IN. INSULATION TEMP RANGE 0 DEGREES TO 850 DEGREES F INSULATION APPROX R VALUE 8.70 INSULATION APPROX K VALUE 0.23 COLOR WHITE STANDARDS ASTM C547 TYPE 1 ASTM C585 ASTM C1136 NRC 1.36 ASTM C795 MIL-I-24244C MEA COMPLIANT - EQUAL TO G1994618