活接
活接 loose joint
活接地 swinging earth
活接结合 articulated joint
活接联接器 joint coupling
活接三通 union tee
活接头 articulation; union swivel; union
活接头螺母 union nut
活接头螺栓 swing bolt
活接头套管 union thimble
活接卸槽 articulated chute (浇混凝土用的)

弯头 joint
弯头 angle fittings; bent pipe; elbow; knee
弯头扳手 bent-handle wrench; bent spanner
弯头车刀 angular tool
弯头持针钳 curved needle