1.API 6A 2.KQ65-60 KQ65-35 3.PSL1, PSL2,PSL3,PSL4 4.AA,BB, ... ,DD,EE,FF 5.PR1,PR2 KY65~60 wellhead equipment ,is mainly used in oil extraction ,it consists of bottom flange,tapper ... 7/8″ EUEConnecting Casing5 1/2″Connection TypeClamp Connector KQ65-60 PSL2 oil wellhead equipment api 6a cheristmas tree