The LD-B02 Tubing Head Adapter is equipped with Acme threads that make up with the 02 Coupling. This coupling is supplied with BPV threads. The adapter is equipped with seal rings on the inside plus test ports on the flange for the purpose of testing all seals at the Christmas Tree flange. The LD-02 Coupling, which has the Acme threads and BPV threads, also can be supplied with the operator’s desire of tubing threads on the inside top and inside bottom of the coupling.