دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. a pipe fitting on which the external thread is larger than the internal thread to allow two pipes of different sizes to be connected.2. a removable lining or sleeve inserted or screwed into an opening to limit its size, resist wear or corrosion, or serve as a guide.

n: The coupler used to connect different size of pipes. One end is male thread and the other is female thread.