| Water Flow Rates (GPH) | ||
| Pipe Size (ID) | Gravity Drain | Pressure Return |
| 1/2 Inch | 200 | 1,260 |
| 3/4 Inch | 400 | 2,160 |
| 1 Inch | 600 | 3,510 |
| 1.25 Inch | 1000 | 5,940 |
| 1.5 Inch | 1400 | 7,560 |
| 2 Inch | 2200 | 12,000 |
| 2.5 Inch | 3200 | 17,550 |
These are estimates. Your mileage may vary.
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| Water Flow Rates (GPH) | ||
| Pipe Size (ID) | Gravity Drain | Pressure Return |
| 1/2 Inch | 200 | 1,260 |
| 3/4 Inch | 400 | 2,160 |
| 1 Inch | 600 | 3,510 |
| 1.25 Inch | 1000 | 5,940 |
| 1.5 Inch | 1400 | 7,560 |
| 2 Inch | 2200 | 12,000 |
| 2.5 Inch | 3200 | 17,550 |
These are estimates. Your mileage may vary.