Since it has a curve like a drain pipe, water will get caught there and keep bugs from getting into the tank.
由于它和排水管一样有一个弯道，里面就存有一些水把虫子挡在水箱外面。
Drain line: the hydraulic components leaked oil into the return pipe or tank.
泄油管路：将液压元件泄露的油液导入回油管或油箱。
Periodical inspection and maintenance of water supply system, supplying pipe, tape and tank, drain pipe.
给水装置的管线、头、箱及排水管道的定期检查和维修。
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