1.Porticular petroleum equipment of electric submersible pump. 2.Head adopts single layer casing head, ... : AA, BB, CC, DD, EE, FF, HHThe level of specification: PSL1~ 4The level of performance: PR1~ 2 Description: Head adopts single layer ... can be used" BT"," P"," BES" and many other types of seal, reliable sealing, simple operationBy the tubing hanger mandrel type ...