Abstract: An arrangement for testing a metal seal at a wellhead joint between a tubing head adapter for a tubing hanger. An inner sleeve is installed at the joint and extends within the adapter and within the hanger at a location spaced inwardly of the metal seal to form a pressure chamber therebetween for receiving test fluid. The fluid is delivered through a passage in the adapter to test the seal for leakage from the inside of the joint. Another test chamber is formed between the metal seal and a secondary seal located between flanges of the tubing head and adapter. A second test passage is formed in the adapter to direct test fluid to the second chamber for seal testing purposes.