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.

• 筒体上设有手孔（或人孔），以便清理、检修。瓶头阀上设有进气阀、出气阀，安全阀、压力表和压力表阀、泄放阀等。