The pipe counterpart structure produced by our company is compact, high counterpart accuracy, wide application range; simple and fast to operate. The simple and optimized air path system provides a smooth passage, makes the operation simpler, and the adjustment is simple, fast and convenient. Easy maintenance, saving time and improving efficiency. External counterpart for long heat transfer chemical oil and gas pipelines of various models and sizes, suitable for short-term natural gas/heat/petrochemical pipeline projects. Pipe outer counterpart is essential equipment for pipeline counterpart operation under special working conditions in pipeline construction. WD series pipe outer counterpart can be used in 2-80 inch carbon steel pipe counterpart operation of different materials.