连顶接头 hook-up nipple

衬管顶部接头 liner top sub

联顶接头 landing sub

顶部旋转接头 rotary top sub

桁架顶接头 [建] peak joint

圆顶宽边接头螺钉 binding post screw

顶灯灯头接线端 head cap terminal

顶部钻具接头 top tool joint

头顶花洒连接器 overhead shower connector