How to use: 1. Clean up the two threaded interfaces that need to be sealed and keep them clean. 2. Wrap the end of the Teflon tape around the internal thread interface, the winding direction should be consistent with the direction of rotation of the two interfaces. 3. Use Teflon tape to completely cover the internal thread interface. 4. Screw the external thread interface to the internal thread interface wrapped with tape and tighten it. 5. Open the valve and check whether the sealing is good, if not, you can increase the thickness of the winding tape.