Mine Used Hose: Diameter:1.5",1.75",2",2.5", ... ,Red,etc. Work Pressure:10Bar,14Bar,17Bar,21Bar,28Bar The mine used hose refers to the chloroprene rubber hoses used for ... coal mine fire prevention, draining water and ventilation, and so on. This ... ,14/20,17/250 30/450,42/600,51/750 Mine Used Hose