pipeline dope), you can substitute with plumber’s tape in the exact same applications where there’s threads. If you know about using pipe-joint compound (a.k.a. Where Plumber’s Tape (Teflon Tape) is Used The pipe is now all set to be screwed into the fitting. Smooth the loose end down over the threads.
Break the tape from the roll by grasping it in between thumb and forefinger and pulling sharply it breaks quickly. Wrap a total of four to six twists around the pipe, completing near the end of the threads (opposite the end of the pipe). Work far from the end of the threads, overlapping the tape as you go. 
Keep tension on the tape so it covers snugly around the pipe. Start covering the tape around the pipe in the opposite direction to the direction the pipe will be screwed on. The tape should lie flat (not bunched up) over the threads and extend perpendicularly to the length of the pipeline. Start the plumber’s tape on the second thread from the end of the pipe and hold it in place with a finger or thumb. Clean the male threads at the end of the pipeline with a clean rag or brush. You wrap the tape around the pipe in the opposite instructions of how the pipeline will turn into the fitting. When the threaded pipe is twisted into the fitting, the friction of the mating threads ought to work to tighten the tape around the pipe, instead of work against it and tear up or ball up the tape. The trick to getting plumbing’s tape right is to wrap it around the pipe in the proper direction. Plumber’s tape, frequently called Teflon tape, (polytetrafluoroethylene, or PTFE) greatly helps with water tight seals on threaded pipeline joints. 
Plumber’s tape is very easy to use, but there’s a right way and a wrong way to apply it. It also helps lubricate the connection, making the threading a bit smoother, and it helps to prevent pipelines from sticking when you wish to disassemble the joint. Plumber’s tape is suggested for use with many threaded connections that do not have a built-in rubber seal. Tips For Using Plumber’s Tape Tips For Proper Use of Plumber’s Tape
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