union swivel end 转环联结端 ; 转环连接端 ; [机] 联管节旋转端

air union swivel 气管旋转联管节 ; 气管旋转接头

spheric union swivel 球面活管接旋转接头

interior plug union swivel 内丝活接

exterior plug union swivel 外丝活接

articulation union swivel union 活接头

spherical union swivel 球面活管接旋转接头

Dart Union Swivel 接头

swivel union [机] 转向管接头