US keeps duties on China's pipe fittings .

美国继续征收碳钢对焊管件反倾销税。

Pipeline is composed of pipes, pipe fittings and valves.

管路是由管子、管件和阀门组成。

Satisfy the forming requirements of reducing pipe fittings.

适合异径管件单头扩缩等成型加工需要。

The production of pipe fittings of professional manufacturers.

生产管件的专业厂家。

Other pipes are PP-R pipe and pipe fittings with thermal connection.

其余给水管材均采用PP - R管及管件，热熔连接。