| Diameter (mm) | Circumference (inches) | UK Sizing | EU Sizing | |
|---|---|---|---|---|
| J 1/2 | 15.7 | 1.94 | J 1/2 | 49 |
| L 1/2 | 16.51 | 2.04 | L 1/2 | 52 |
| N 1/2 | 17.32 | 2.17 | N 1/2 | 55 |
| P 1/2 | 18.14 | 2.24 | P 1/2 | 57 |
| R 1/2 | 18.95 | 2.37 | R 1/2 | 60 |
| T 1/2 | 19.97 | 2.44 | T 1/2 | 62 |
| V 1/2 | 20.6 | 2.57 | V 1/2 | 65 |
| Diameter (mm) | Circumference (inches) | UK Sizing | EU Sizing | |
|---|---|---|---|---|
| J 1/2 | 15.7 | 1.94 | J 1/2 | 49 |
| L 1/2 | 16.51 | 2.04 | L 1/2 | 52 |
| N 1/2 | 17.32 | 2.17 | N 1/2 | 55 |
| P 1/2 | 18.14 | 2.24 | P 1/2 | 57 |
| R 1/2 | 18.95 | 2.37 | R 1/2 | 60 |
| T 1/2 | 19.97 | 2.44 | T 1/2 | 62 |
| V 1/2 | 20.6 | 2.57 | V 1/2 | 65 |