The leak director detects tube leackage merely by pressing a button. The Pressurizing gun and plugging gun are inserted into opposite ends. Pressuring Gun lets in air to pressurise the tube to 100psi with compressed air. The guage will show and hold the pressure if there are no leaks. Conversly, apressure drop is indicated on guage incase of tube leak. A quick slide of exhaust valve silently lets out the air in tube and releases the gun for next tube test.