he Tubing Head Adapter is assembled to the top of the Tubing Head and is located on the bottom of the Xmas Tree Assembly. TUBING HEAD ADAPTER FUNCTIONS: Attaches above the Tubing Head and seals off the production tubingAllows to test tubing hanger seals with test portControl line ports are optionally providedMODELS AVAILABLE: B1 (Threaded male top and female bottom tubing connection)B2P (Studded top with threaded female, up tubing bottom connection)A5P-EN (Studded top with bottom prep for extended neck hanger)BO2 (Coupling type adapter)BO10 (Coupling type adapter with coupling nut)