Double jacket 600 PSIG test all polyester hose intended to transfer large volumes of water with minimal friction loss. Lightweight and compact, occupies less space than conventional single jacket hose. Meets NFPA requirements for attack, relay and supply line hoses. Construction: circular woven, double jacket, 100% virgin spun polyester. Tube: Extruded T.P.U. elastomer - ozone and age resistant.