... gas mining equipment, from the casing head, tubing head, oil (gas) tree consists of three parts, used to connect casing string, tubing string and sealing ... and regulate oil (gas) wellhead flow, can also be used for acid fracturing, water injection, testing, and other special operations. Product ... productsAA,BB,CC,DD,EE,FFApply MEDIAOil, gas, mud, etc API 6A wellhead christmas tree