XZFTB6 Capacity(kg)：6±0.03 Pressure of nitrogen(MPa)：1.2 Effective discharging time(MPa)：≤9 Class of rating：≥14B Protective semi-diameter(m)：≥0.94 Outer dimension D(mm)：282 Outer dimension H(mm)：300 Packing Pcs/ctn：1 Size(cm)：31×31×31 XZFTB8 Capacity(kg) 8±0.04 Pressure of nitrogen(MPa) 1.2 Effective discharging time(MPa) ≤10 Class of rating ≥18B Protective semi-diameter(m) ≥1.07 Outer dimension D(mm) 306 Outer dimension H(mm) 322 Packing Pcs/ctn1 Size(cm) 33×33×39 G.W(kg) 12.50