Hollow, threaded cylinder which is used to link larger and smaller pipes together by increasing an outside diameter or decreasing an inside diameter, for a better fit.
device used to adapt a pipe, fitting, faucet or valve to a threaded opening of a larger size. Has internal & external threads
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. Site Preparation | Drilling | Well Completion | Servicing | Plug and Abandon Well General Safety | Additional References | JSA | Site Map | Illustrated Glossary | Glossary of Terms