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Description: The top spool on a wellhead assembly contains the highest pressure in the wellhead, and contains a load shoulder to hang the tubing hanger and tubing string. When the well is completed, the tree is installed on top of the head with a tubing head adapter. Providing a means to support and test the BOPs while completing the well, the tubing head is a necessary component when drilling and completing a well.

Function: provide a shoulder to support the tubing hanger and sealing;

           Provide a sealing hole for tubing hanger and packing off;

           Provide the secondary sealing for top casing;

           Provide a channel in the tubing and production casing;