Check-All Series UN-3 Size & Dimensions
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| Nominal Pipe Size | Style Number | A | Hex Size B* | C | Orifice Diameter |
| 3/8 | UN-3-0375 | 2-5/32 | 13/16 | 3/8 NPT | 0.348 |
| ½ | UN-3-050 | 2-23/32 | 1-1/8 | ½ NPT | 0.464 |
| ¾ | UN-3-075 | 2-15/16 | 1-¼ | ¾ NPT | 0.593 |
| 1 | UN-3-100 | 3-41/64 | 1-5/8 | 1 NPT | 0.890 |
| 1-¼ | UN-3-125 | 3-29/32 | 2-¼ | 1-¼ NPT | 1.135 |
| 1-½ | UN-3-150 | 4-23/64 | 2-½ | 1-½ NPT | 1.385 |
| 2 | UN-3-200 | 5-27/32 | 3 | 2 NPT | 1.555 |
| 2-½ | UN-3-250 | 5-½ | 3-¾ | 2-½ NPT | 1.555 |
| 3 | UN-3-300 | 6-¼ | 4-½ | 3 NPT | 2.025 |
| 4 | UN-3-400 | 7-1/8 | 5-½ | 4 NPT | 2.560 |
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