The Dixon Valve A525-50RAF polyester 500# single jacket fire hose has a 2-1/2" ID and is 50 ft. long. Its tube is made of EPDM (ethylene-propylene diene-terpolymer) synthetic rubber for resistance to aging and ozone, and its cover consists of a single jacket of polyester, which resists abrasion and flex fatigue. These two components are fused together through a vulcanization process that eliminates the need for a separate reinforcement layer to maintain a maximum working pressure of 225 pounds per square inch (psi). This hose will function effectively at temperatures ranging from -10 to +150 degrees F, and comes equipped with factory-installed male and female aluminum National Standard Thread (NST) rocker lug expansion ring couplings. This hose is suitable for high-volume water conveyance operations typical to fire departments.Industrial hoses transfer or convey air or liquid in hose systems. When selecting industrial hoses, use the STAMPED method: S = Size (ID, OD, and length) T = Temperature (maximum and minimum temperatures of material being transported) A = Application (industry or process) M = Material (to be conveyed, type and concentration) P = Pressure (maximum working pressure) E = Ends (type of end connectors or couplings on hose) D = Delivery method (volume and velocity)The inside diameter of the hose must be adequate to keep pressure loss to a minimum and avoid damage to the hose due to heat generation or excessive turbulence. The hose must be capable of withstanding the minimum and maximum temperatures that occur within the hose system. Some applications require specialized oils or chemicals to be conveyed through the system. In this case, hose selection must ensure compatibility of the hose tube, cover, couplings and O-rings with the fluid used. Industrial hoses are used in systems such as air compressors, automatic manufacturing operations, aircraft controls, and tire installation in industries including agriculture, mining, road construction, firefighting, and aviation.Dixon Valve & Coupling Company manufactures pipe and hose fittings and accessories. The company, founded in 1916, is headquartered in Chestertown, MD.