供、排水系统：从车间外墙外1米处的接点至用水设备的供水、排水管道。
Water supply and drainage system: the water supply and drainage piping from the joint at 1m from the workshop outside wall to water users.
换装室内供水水管通常较换装排水系统便宜，后者会严重影响预算。
Replacing interior supply lines is generally less expensive than replacing drains, which can put a big dent in a budget.
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