| 摘要 |
he invention relates to a new-type coupling destined to be employed in a water distribution array, which coupling is made of plastic material for use in manholes and applications in the irrigation and water supply field. The coupling in question bears at the left side a male-type thread, two or several mobile and free to slide nuts at the top, and a mobile and free to slide nut connection at the right for in-series connection of the pipes, which coupling is characterised by interposition of safeties encountered at all nut connections, at the points where the foregoing nuts adjoin the main body of the coupling. |
