... h 7. All connectors are jointed by bolt nut and washer and so on. No welding is required. Xiamen Longyoung Agricultural Technology Co., Ltd ... can contact us by the ways as bellow: Xiamen Longyoung Agricultural Technology Co., Ltd. Add: No.81, Xindian Town, Xiang' ... h 7. All connectors are jointed by bolt nut and washer and so on. No welding is required. Xiamen Longyoung Agricultural Technology Co., Ltd ...