玖玖精品视频,久久天堂网,国产欧美一区二区三区鸳鸯浴,国产91久久精品一区二区,日韩美女一区二区三区,91在线精品国产丝袜超清,欧美精品免费在线

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

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