将焊有球头的管子与外螺纹接头中心相对，旋转螺母使其自动对中心后，敲击螺母使螺母旋紧。
Make the pipes with button head align with the joints of external thread, rotate the nut and make it align to the center, knock the nut and screw up the nut.
将焊有球头的管子与外螺纹接头中心相对，旋转螺母使其自动对中心后，敲击螺母使螺母旋紧。
Make the pipes with button head align with the joints of external thread, rotate the nut and make it align to the center, knock the nut and screw up the nut.
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