This crystal clear FDA hose has a corrugated cover for increased flexibility and a smooth bore to eliminate material build-up. Recommended for bulk handling of resin, pellets, powdery materials, as well as liquid, solid, and semi-solid food products. The working pressure and vacuum ratings are based on ambient temperature of 70° F and will vary inversely with temperature changes. Safety Factor : 3:1 Temperature range : -10 to 140° F Construction : Tube & Cover : Clear PVC Reinforcement : Clear PVC helix. The recommended procedure to maintain serviceability of PVC hose when not in use : Disconnect and drain. Keep hose straight and flat. Avoid extreme heat and cold. Store out of direct sunlight.