Poly-Cord ring-spun polyester warp yarns are combined with filament polyester filler yarns. Available either plain/uncoated “natural” white, or with our optional Ultra-Shield high performance polymeric coating applied to seal each and every fiber in the bundle, further improving the abrasion resistance, reducing moisture and chemical absorption, and providing vivid color-coded identification. The Dura-Thane polyurethane inner lining is extremely light weight and compact, and is a National Sanitation Foundation (NSF 60) approved material for safely conveying drinking water. The Friction Fighter System in Poly-Flow 600 LDH creates an extremely smooth waterway surface, thereby significantly reducing friction loss and improving flow characteristics. With less weight and more compactness than nitrile rubber- covered single jacket reinforced hose, Poly-Flow 600 LDH loads more tightly and requires less hose bed space, while at the same time providing more pressure capability, maneuverability and flexibility. Designed to accomplish three separate firefighting roles, including, Attack, Relay and Supply applications as defined by NFPA 1961, requiring a higher margin of safety than is possible with nitrile covered hose. Both the hose and couplings are made in the USA, performance shall meet and exceed NFPA 1961 standards.