High-Pressure Rotary Drilling Hose with API 7K Certification for Oil Drilling Description: 1. Purpose: Suitable for the flexible connection between the top of the drilling riser and the vertically movable faucet in the oil drilling and mud transportation system, used to adjust the installation error to facilitate connection and isolation of vibration 2. Structure: It is composed of inner rubber layer or stainless steel armored inner tube, carbon fiber reinforced layer, middle