Abstract: A tubing hanger for locking to a tubing head is provided on its outer surface with a metal seal that seals between the tubing hanger and the tubing head when weight or hydraulic pressure is applied on the tubing hanger. This can be done either as a result of the weight of tubing hanging from the hanger or by applying pressure on the hanger from above. Elastomer seals may be provided above and below the metal seal so that the integrity of the metal seal can be tested. The seal is broken by disengaging a wedge ring and pulling the tubing hanger out with a running tool. The metal seal can either be used with conventional tubing hangers or with a purpose-designed tubing hanger. In this latter case, the number of operations needed to set the wedge ring can be reduced.