screwed fittings plug 连接件插件 ; 螺纹接头插头
Hose fittings with screwed ferrules 带螺旋箍的软管管件
Screwed type steel pipe fittings 螺旋式钢管配件
Two types of end are standard on steel pipes and fittings, that is flanged and screwed.
钢管和管件有两种标准端部型式，即：法兰和丝扣。
Two types of end are standard on steel pipes and fittings, that is flanged and screwed.
钢管和管件有两种标准端部型式，即：法兰和丝扣。 。
Two types of end are standard on steel pipes and fittings that is flanged and screwed.
钢管和管件有两种标准端部型式，即：法兰和丝扣。
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