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USA Japan Britain Inside Diameter MM / Inches 2 2 D 13.2 / 0.52 3 4 F 14.1 / 0.55 4 7 H 1/2 14.9 / 0.59 5 9 J 1/2 15.7 / 0.62 6 12 L 16.5 / 0.65 7 14 N 17.4 / 0.68 8 16 P 1/2 18.2 / 0.72 9 18 R 1/2 19.0 / 0.75 10 20 T 1/2 19.8 / 0.78 11 23 V 1/2 20.7 / 0.81 12 25 Y 21.4 / 0.85

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