Pipe Stoppers are used to plug off pipe ends, which should be auxiliarily used with pipe couplings. 管塞用於封堵鋼管端部管口，須與管接頭配套使用。
Two containers of mercury, connected by a small-bore pipe, are mounted so as to tilt with the gyro. 兩個裝有水銀的容器用小口徑的管道連接，安裝得使它們可以隨著陀螺傾斜。
The trap shall have straight through pipe connections, the air vent shall be serviced without breaking pipe connections and should be an open float design. 這種疏水閥應該採用直線穿過管道連接方式，應該是一種開口浮子設計。
