推荐回答（2个）
价格与产地和质量，型号（S）都有关，不一定。关于管的规格主要有以下的：
管材外径及参考内径尺寸（单位mm）
公称直径
dn 平均外径 参考内径
最小值 最大值 S4 S3.2 S2.5
20（4分） 21.6 22.1 15.1 14.1 12.8
25（6分） 26.8 27.3 19.1 17.6 16.1
32（1寸） 33.7 34.2 24.4 22.5 20.6
40 42.0 42.6 30.5 28.2 25.9
50 52.0 52.7 38.2 35.5 32.6
63 65.4 66.2 48.1 44.8 41.0
75 77.8 78.7 58.3 54.4 49.8
90 93.3 94.3 70.0 65.4 59.8
110 114.0 115.1 85.8 79.9 73.2
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