1) Control and adjust oil well production 2) Provide various downhole ... PSL1-3Normal Size: Main (in): 2-9/16, 3-1/8, 3-1/16Side (in): 2-9/16Technical Specifications of Christmas ... Bottom threads connectionCasing Size (in): 5-1/2, 7, 9-5/8, 12-1/4,13-3/8, 20, 30PR ... Class: AA-HHTechnical Specifications of Tubing HeadNominal Dia.(in): 7-1/16 ~ 13-5/8Working Pressure: 2,000~20,000PSIWorking Temperature: ...