The forged or cast steel fitting made of a body and hanger-packer mechanism (tubing hanger) on the top part of the wellhead. It is mounted on the top flange of the uppermost casinghead.
The tubinghead seals the annular space between the casing and tubing string while suspending the tubing string in the well. On a low-pressure well, the tubing head is directly connected to the casing and not the casinghead.