The size designations of stainless steel loops are nominal. Theactual volumes can differ from the theoretical designations becauseof the ± 0.025 mm (0.001") tolerance of the metal tubingbore. Accuracy of large metal loops (1.0 mm, 0.040" bore) is about±5%, intermediate loops (0.5 mm, 0.020" bore) ±10%,and small loops (0.2 mm, 0.007" bore) ±30%. Bore: 0.51mm.Model 7725 Injector loops are not interchangeable with loops forthe Model 7125. The port angle for the 7725 is 30° whereas theport angle for the 7125 is 20°, requiring the loops to have adifferent shape.