cylinder drain cock

例句：

1. 1.The plumber used a cylinder drain cock to clear the blockage.
   水管工使用一个水桶排水阀来清除堵塞。
2. 2.The drain cock was rusted and needed to be replaced.
   排水阀生锈了，需要更换。
3. 3.The plumber had to use a special tool to remove the cylinder drain cock.
   水管工不得不使用一种特殊的工具来移除水桶排水阀。