規格 外徑 內徑 包裝 3/8” 17.0 12.6 50M 1/2” 20.5 16.0 50M 3/4” 25.8 21.0 50M 1” 31.9 26.3 50M 1-1/4” 41.2 35.0 30M 1-1/2” 46.9 40.3 30M 2” 58.4 51.6 20M 2-1/2” 72.6 63.3 10M 3” 88.4 78.3 10M 4” 113.8 102.1 10M