The roundness of the eccentric reducer should not exceed 1% of the corresponding outer diameter at the ends, and the allowable deviation is ±3mm. The material of the eccentric reducer complies with SY/T5037, GB/T9711, GB/T8163, ASME ASTM A106/A53 GRB, API 5L, APT5CT, ASTM A105, ASTM A234, ASTM A106, DIN German standards, and customer-specified standards. The eccentric reducer ( reducer bushing) is a type of pipe fitting used at pipe transition sections. The commonly used forming processes include reducing diameter extrusion, expanding diameter extrusion, or a combination of both. For certain sizes, stamping forming can also be employed.