- Casing Head HousingsThe adapter (usually flanged) between the first casing string and either the BOP stack (during drilling) or the next wellhead stage (after completion), and allowing suspension and sealing of the secondary casing string
- Casing Head SpoolsThe adapter (usually flanged) above the Casing Head and either the BOP stack (during drilling) or the next wellhead stage (after completion), and allowing suspension and sealing of another casing string.
- Tubing Head SpoolsThe adapter attached above the casing head/spool and the smallest casing string, used to suspend and seal the production tubing string.
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