Pipe Stoppers are used to plug off pipe ends, which should be auxiliarily used with pipe couplings. 管塞用于封堵钢管端部管口，须与管接头配套使用。
Two containers of mercury, connected by a small-bore pipe, are mounted so as to tilt with the gyro. 两个装有水银的容器用小口径的管道连接，安装得使它们可以随着陀螺倾斜。
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. 这种疏水阀应该采用直线穿过管道连接方式，应该是一种开口浮子设计。
