Abstract: A universal testing tool is disclosed for accommodating gas system pressurization and leak detection. The tool includes a manifold body for interconnection of and fluid communication between one of several system adapters, a pressure gauge, a fluid intake stem, and a pressure relief valve. The system adapters are utilized for changing configurations of the tool to adapt to different system leads, each including a hand manipulable central body portion between a size/configuration standardized threaded tool mounting end and a variously configured threaded system adaptation end.