90度内外丝螺纹弯头	单头螺纹短节	四方头管塞	六角头管塞
90°Theaded Elbow	Half Theaded Nipple	Square Head Plug	Hexagonal Head Plug
圆头管塞	异径六角双丝头	等径六角双丝头	内外丝异径管
Round Head Plug	Reducing Hex Nipple	Straight Hex Nipple	Threaded Reducer
锻制外螺纹三通
Forging Male Tee