1. PVC管（聚氯乙烯管）
– 直径：25mm, 32mm, 40mm, 50mm, 63mm, 80mm, 100mm, 125mm, 150mm, 180mm, 200mm, 225mm, 250mm, 275mm, 300mm, 325mm, 350mm, 380mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 900mm, 1000mm, 1200mm, 1500mm, 1800mm, 2000mm, 2250mm, 2500mm, 2750mm, 3000mm, 3250mm, 3500mm, 3800mm, 4000mm, 4500mm, 5000mm, 5500mm, 6000mm, 6500mm, 7000mm, 7500mm, 8000mm, 9000mm, 10000mm, 12000mm, 15000mm, 18000mm, 20000mm, 22500mm, 25000mm, 27500mm, 30000mm, 32500mm, 35000mm, 38000mm, 40000mm, 45000mm, 50000mm, 55000mm, 60000mm, 65000mm, 70000mm, 75000mm, 80000mm, 90000mm, 100000mm, 120000mm, 150000mm, 180000mm, 200000mm, 225000mm, 250000mm, 275000mm, 300000mm, 325000mm, 350000mm, 380000mm, 400000mm, 450000mm, 500000mm, 550000mm, 600000mm, 650000mm, 700000mm, 750000mm, 800000mm, 900000mm, 1000000mm, 1200000mm, 1500000mm, 1800000mm, 2000000mm, 2250000mm, 2500000mm, 2750000mm, 3000000mm, 3250000mm, 3500000mm, 3800000mm, 4000000mm, 4500000mm, 5000000mm, 5500000mm, 6000000mm, 6500000mm, 7000000mm, 7500000mm, 8000000mm, 9000000mm, 10000000mm, 125m/s (每秒125米)
2. PEX管（交联聚乙烯管）
– 直径：16mm, 25mm, 32mm, 48mm, 63mm, 89mm, 114mm, 146mm, 178mm, 214mm, 252mm, 292mm, 338mm, 392mm, 452mm, 512mm, 572mm, 632mm, 692mm, 752mm, 812mm, 872mm, 932mm, 1m/s (每秒1米)
3. HDPE管（高密度聚乙烯管）
– 直径：16mm, 25mm, 32mm, 48mm, 63mm, 89mm, 114mm, 146mm, 178mm, 214mm, 252mm, 292mm, 338mm, 392mm, 452mm, 512mm, 572mm, 632mm, 692mm, 752mm, 812mm, 872mm, 932mm
4. CPVC管（氯化聚氯乙烯管）
– 直径：16mm, 25mm, 32mm, 48mm, 63mm, 89mm, 114mm, 146mm, 178mm, 214mm, 252mm, 292mm, 338mm, 392mm, 452mm, 512mm, 572mm.
5. GRP管（玻璃纤维增强塑料管）
– 直径：16mm, 25mm, 32mm, 48mm, 63mm, 89mm, 114mm, 146mm, 178mm, 214mm, 252mm, 292mm, 338mm, 392mm, 452mm, 512mm
6. SCP管（不锈钢复合管）
– 直径：16mm, 25mm, 32mm
7. UPVC管（硬聚氯乙烯管）
– 直径：16mm, 25mm
在选择下水管时，除了考虑尺寸外，还需要考虑以下因素：
– 材料：不同的材料有不同的耐压、耐热和耐腐蚀性能。
– 壁厚：壁厚越大，管道的强度和耐用性越好。
– 连接方式：螺纹连接、法兰连接或卡箍连接等。
– 安装要求：有些管道需要水平安装，而有些则需要垂直安装。
– 成本：不同材质和规格的管道价格差异较大。
为了确保安全和舒适，建议在选购下水管时咨询专业人士，并按照当地的建筑规范和标准进行选择。