Unverified92% confidenceFactTime unknown
管径标注DN(公称直径)与De(外径)不可混淆：PPR的De20对应DN15(4分)、De25对应DN20(6分)、De32对应DN25(1寸)，购买生料带缠绕转接需按外径选配
1
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92%
Confidence
Long-term
Relevance
-
First Seen
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Unverified大杯型（D+）人群选购路径：优先看是否支持罩杯+下围双维度独立选码（如32D/34DD）而非S/M/L笼统尺码，再确认为压缩+包裹复合结构+宽肩带+后扣可调，最后跳跃实测64% similarUnverified廉价可变ND(VND)在两端极限档位会出现X形黑十字暗带(cross pattern)，建议选调节范围窄的ND2-ND32而非ND2-ND400的大范围产品62% similarUnverified接口尺寸需与入户主管匹配，国内家装总管多为4分(DN15)或6分(DN20)，选购前务必测量；接口不符需转接头，转接过多会造成额外压损和渗漏点60% similarUnverifiedD型和P型胶条压缩回弹性好，适配缝隙2-5mm；缝隙>5mm应选E型或大D型，缝隙<2mm选I型（平贴）或V型，型号不匹配会导致关不上或密封不严60% similarUnverified安装方式按接口选：丝扣(螺纹)适合DN15-DN25家用管、易自行拆装；卡套适合薄壁不锈钢管；法兰用于DN50以上大口径工业管——家用几乎都是丝扣59% similar
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