For connecting steel pipe wiring pipline; 2. Made of quality carbon steel with Zinc surface-plating; 3. Need to change diameter or metric system thread NPT thread can be made specially.是什么意思_For connecting steel pipe wiring pipline; 2. Made of quality carbon steel with Zinc surface-plating; 3. Need to change diameter or metric system thread NPT thread can be made specially.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句