gravity sewers meaning in English

重力下水道

Standard specification for ductile iron gravity sewer pipe
球墨铸铁污水管标准规范
Gravity sewer system
引力污水渠系统
Test method for installation acceptance of plastic gravity sewer lines using low - pressure air
使用低压空气对塑料自流排水管道安装验收方法
Test method for installation acceptance of plastic gravity sewer lines using low pressure air
使用低压空气对塑料自流排水管道进行安装验收的试验方法

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