The PBB-90HP is an insulated barrier bag that measures 90 inches wide, 36 inches high, and 6 inches deep. Protecting the backflow device from frost, the Polar Bearier bag provides an R-30 insulation rating using Radiant Barrier Foil (RBF) inserted between acrylic polyester and air bubble pack. The PBB-90HP is compatible with the SBBC-90ALHP, and SBBC-90ALHPI enclosures.