标准直径20的ppr水管家装够用吗？要不要用更厚的？需要换更粗的吗？
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家装水电改造中ppr水管直径20，2.8壁厚的够用吗？为什么有人会升级壁厚为3.4？为什么还有人会换直径25的水管？这些升级有必要吗？是智商税吗？
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