POLY-RACK 500™ has a 100% synthethic jacket with a single ply polyurethane extruded liner. This hose is totally immune to the effects of midew. POLY-RACK 500™ will replace unlined hose foot for foot on existing storage devices. It is designed for Emergency Fire Protection with water pressure not exceeding 225 PSI per NFPA 1961. Available in 50 Ft., 75 Ft. and 150 Ft. lengths.** Available with Factory Mutual Label and UL Label. * Acceptance Test Pressure is 300 PSI for UL Labeled Product.