Industrial Duct Hose, Hose Inside Dia. 4 in, Hose Length 12 ft, Hose Tube Material Fiberglass Neoprene, Hose Reinforcement Type Helix, Hose Reinforcement Material Steel Wire, Hose Color Black, Vacuum Rating 21 Hg, Max. Working Pressure @ 70 F 28 psi, Temp. Range -40 Degrees to 300 Degrees F, Standards UL94V-O, Bend Radius 3 in