dongdu copper nipple joint 1 minute 2 minutes 3 minutes 4 minutes reducing nipple joint 2 minutes turn 4 minutes double head exterior thread coupling 动渡铜对丝接头1分2分3分4分变径对丝接头2分转4分双头外丝接头

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2-minute double outer wire 3 points double outer wire 4 points double outer wire 2-minute turn 4-minute double outer wire 4-minute turn 6-minute double outer wire 1-inch to 4-minute double outer wire refill 6 to 4 3-minute turn 4-minute double outer wire