Applicable scope: for drilling, cementing, repairing and so on, as flexible connectors for mud pipe sink, cementing pipe sink, throttle pressure sink, and so on, water base or oil base mud, cement slurry and well washing fluid are transported under high pressure. Temperature range: -30C ~80C, can also be manufactured according to user requirements. Structure: synthetic rubber inner rubber layer with oil resistance, weak acid resistance and alkali, 2-8 layer steel wire winding structure reinforcement layer, and oil resistant and weathering aging outer glue layer. Type of connectors: API Spec 7K pipeline and tubing thread, and can also be manufactured according to user requirements. Execution standard: GB/24145-2009