A tool for assisting the leak testing of an enclosed volume is disclosed. The tool may comprise an outer seal defining inside its perimeter an attachment face of the tool. A vacuum port defined in the attachment face is configured to be fluidly coupled to a vacuum source. A nozzle disposed in the attachment face may be coupled to the test port, in fluid communication with the enclosed volume. A primary connection in fluid connection with the nozzle may be placed in fluid connection with the external conduit. A nozzle seal is disposed in the attachment face around the perimeter of the nozzle, such that when the nozzle is coupled to the test port, the nozzle is fluidly isolated from said vacuum port. A leak-test system incorporating at least one tool and a method for leak testing an enclosed volume using the tool are disclosed.