Underground Fire Hydrant 1.Material of body:cast iron 2.Material of coupling:copper alloy 3.ISO and CCCF certified underground fire hydrant1.Nominal Diameter:100mm(4"),150(6")2.Open light:50mm,55mm3.Working Pressure:1.6mpa4.Strength Test Pressure:2.4mpa5.Applicable medium:water,foam mixed Underground Fire Hydrant