1.外螺纹直通管接头
Outside thread goes straight to an union joint.
2.内螺纹直通管接头
Inner thread goes straight to an union joint.
3.螺塞
Plug screw.
4.异径三通
Different footpath three direct links of trade , mail , and air and shipping services across the Taiwan Straits.
5.异径四通
Different footpath Stone.
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