reducing socket meaning in Chinese

大小头承插管
缩径承窝
异经管节
异径承插管
异径管接头
异径管节, 异径管接
异径套筒

Steel fittings for railway vehicles - t - irons , reducing socket
有轨车辆用钢管配件.三通.缩径三通
Steel fittings for railway vehicles - sockets , reducing sockets
有轨车辆用钢管配件.套节.异径套节
Beaded eccentric reducing socket
偏心带边异径管箍
Pipe joints and elements for polypropylene pressure pipelines , types 1 and 2 ; turned and pressed reducing sockets for butt - welding , dimensions
1型和2型聚丙烯压力管道用管接头和零组件.用于对焊的
Pipe joints and elements for high pressure polyethylene pressure pipelines , types 1 and 2 ; turned and pressed reducing sockets for butt - welding , dimensions
1型和2型高密度聚乙烯压力管道用管子接头与零件.对焊