NOTE: This product will only seal small leaks where the refrigerant charge in the system lasts at least 7 days. Use only as directed.STEP 1: Turn the system on and make sure the compressor is running. If it is a heat pump, make sure it is in COOLING mode. BEFORE ANY OTHER CONNECTION, IT IS IMPORTANT TO FIRST connect the female fitting of the LEAK SAVER to the Low Side Service Port of the system. STEP 2: Make sure both valves on the manifold are closed. Connect the High Side Hose (Red) to the High Side Service Port. Briefly open the High Side Manifold Valve to purge the hoses and then quickly connect the Center Hose (Yellow) to male fitting of the LEAK SAVER.  STEP 3: Briefly open the High Side Manifold Valve to inject the LEAK SAVER into the system. As soon as the tube is clear, close the High Side Manifold Valve. Wait one minute for the gauges to equalize and then disconnect the empty LEAK SAVER tube and discard or recycle. Let the system run for at least ONE HOUR to allow sealant to fully circulate.