manhole

a manhole cover.

出入盖。

he lifted the manhole cover and peered into the depths beneath.

他掀起窨井盖向下面深处望去。

inspectors can lamp the lines between the manholes for routine maintenance observations.

检查员能够照亮检修之间线路进行日常维修观察。

Body has handhole (or manhole) for easy wash and examination, And bottle valve set up inlet/outlet valve,safety valve, pressure gauge and pressure gauge valve, drain valve etc.

筒体有手（或），以便清理、检修。瓶头有进气、出气，安全、压力表和压力表、泄放等。