AP ArmaFlex is a flexible insulation material that reliably protects against water vapour ingress due to its closed-cell structure. No additional water vapour barrier is required.
Hugh M. Cunningham AP ArmaFlex® Flexible Elastomeric Insulation, For Pipe Size: 5/8 in, For Pipe Type: Copper, 3/4 in Inside Diameter, 3/4 in Wall Thickness, 0.254 Btu-in/hr-sq-ft-deg F Thermal Conductivity, -297 to 220 deg F, Synthetic Rubber, Black, 6 ft Length