Wellhead casing head 1. OEM, ODM service 2. API approval 3. We supply America, Africa, Europe, Asia, etc. The casing head is a kind of part of connecting casings and wellheads.It is used as supporting the weight of technical casing and oil string casing,sealing the annular space between the casings,It provides atransition joint for the tubing head,Christmas tree and other wellheads,It can also ...