**毛片一级片,a级国产乱理论片在线观看,一级性黄色,一级黄色免费,国产美女操,免费一级欧美在线观看视频片,免费看国产一级片

1)銅連接管(通孔)
Copper connecting tubes(passing through)

2)鋁連接管(通孔)
Aluminium connecting tubes(passing through)