... 2) Christmas tree is an important piece of equipment used to control fluid flowing. Wellhead equipment ... manufacturing level being PSL1, PSL2, PSL3, the performance level of our product being PR1, PR2, under API SPEC ... 6A.The bore of Christmas tree ranges from 7-1/16 to ... manufacturing level being PSL1, PSL2, PSL3, the performance level of our product being PR1, PR2, under API SPEC ...