
| Nominal Pipe Size | Minimum Length, A | Square Head Plugs | |
|---|---|---|---|
| Minimum Square Height, B | Minimum Width Flats, C [Note (2)] | ||
| 1/8 | 10 | 6 | 7.15 |
| 1/4 | 11 | 6 | 9.55 |
| 3/8 | 13 | 8 | 11.11 |
| 1/2 | 14 | 10 | 14.29 |
| 3/4 | 16 | 11 | 15.88 |
| 1 | 19 | 13 | 20.64 |
| 1 1/4 | 21 | 14 | 23.81 |
| 1 1/2 | 21 | 16 | 28.58 |
| 2 | 22 | 18 | 33.27 |
| 2 1/2 | 27 | 19 | 38.10 |
| 3 | 28 | 21 | 42.86 |
| 4 | 32 | 25 | 63.50 |