spool piece

基本解释

Check valve and butterfly valve combinations are very popular; normally a short spool piece is required between the valves.
止回阀与蝶阀的连接是经常发生的事，通常需要在这两种阀门之间加上一节短短的阀槽。
Items that are not compatible should be removed from the system and replaced with a blank, valve, spool piece, or temporary jumper hose.
不配伍的任何零件应从系统中移开并以间隙、阀、管段或者暂时的跨接软管替代。
The product is portable and flexible. There are receding groove every one inch in the steel column, assembling with protruding coil of spool piece.
轻便灵活，钢柱每隔一英吋凹入沟圈与接管片凸出线圈配合组装。

Besides the vegetables, they held a piece of bread, a pocketknife, sometimes the Alpine Club guidebook, and always a spool of wire for emergency repairs.
NEWYORKER: Bear Meat