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| US / CAN | Internal Diameter (mm) | UK / AUS | German |
|---|---|---|---|
| 4 | 14.9 mm | H 1/2 | 15 |
| 4.5 | 15.3 mm | I 1/2 | 15.25 |
| 5 | 15.7 mm | J 1/2 | 15 3/4 |
| 5.5 | 16.1 mm | K 1/2 | 16 |
| 6 | 16.5 mm | L 1/2 | 16 1/2 |
| 6.5 | 16.9 mm | M 1/2 | 16.75 |
| 7 | 17.3 mm | O | 17 1/4 |
| 7.5 | 17.7 mm | P | 17.75 |
| 8 | 18.1 mm | Q | 18 |
| 8.5 | 18.5 mm | R | 18.5 |
| 9 | 18.9 mm | S 1/2 | 19 |
| 9.5 | 19.3 mm | T 1/2 | 19.5 |
| 10 | 19.8 mm | U 1/2 | 20 |
| 10.5 | 20.2 mm | V 1/2 | 20.25 |
| 11 | 20.6 mm | W 1/2 | 20.75 |
| 11.5 | 21.0 mm | X 1/2 | 21 |
| 12 | 21.4 mm | Y | 21.25 |
| 12.5 | 21.8 mm | Z | 21.75 |
| 13 | 22.2 mm | Z+1 | 22 |
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