... AA, BB, CC, DD, EE, FF, HHThe level of specification: PSL1~ 4The level of performance: PR1~ 2Nominal diameter:21 /16" to 41 ... .Integral valve body adopts the forging structure.Has the advantages of compact structure, little space occupation, little connecting piece,Good ... installation.The Christmas trees are fabricated in accordance with the latest version of 6A API Spec. API 6A Standard Dual Tree