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Nipple wrench (plumbing) : ウィキペディア英語版 | Nipple wrench (plumbing)
In plumbing, a nipple wrench is often known as an ''inside'' pipe wrench. An eccentric toothed gear is mounted on a hexagonal shaft. The wrench is introduced inside the pipe (especially a close nipple, which has threading its entire length, and therefore no surface for an outside wrench). As the wrench is turned, the eccentric gear is forced to grip the inside of the pipe. As with a regular pipe wrench, the mechanism is such that the grip on the pipe increases with the torque applied on the wrench. It is a relatively obscure but often useful tool.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Nipple wrench (plumbing)」の詳細全文を読む
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