宁波水电安装介绍在水电预埋时的一些注意点。厨房卫生间排水立管需要在前期预埋阶段留洞，留洞就需要用到套管，留的洞口直径需要比立管直径大，一般大5~10公分即可，过小立管放不进去，还有就是层数多了，上下预留洞误差造成多层洞口不在同一垂线上，装管不顺直。洞口留得大，偏移误差一般可以忽略不计。

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