English: When connecting the threads of two metal pipes, which screw together, or a a plumbing nut that seals a high-pressure hose, teflon tape is wound around the threading in the direction which the screw will take -- three times. This helps seal the connection and prevents water from leaking out through the threads. Source: here entitled "Swapping out a bathroom sink" (handyman project) Note the words "public domain" note at the top of the article. Further questions, ask me (tom sulcer) on my Wikipedia talk page here.